[Fice]

Telling computers and humans apart is a wrong goal. Every request comes from a computer that is commanded by some human. And why shouldn't users be allowed to use automated user agents when they don't do it for spamming or anything malicious?

CAPTCHA is essentially a proof-of-work variant where challenges are designed to be solved by humans rather than computers, and same as any PoW it works by means of consuming some limited resource (human time, processor time, energy).

[teacpde]

A lot of times the purpose is more on rate limiting than disallowing bot access. The goal to tell apart is on the premise that humans are a lot slower than bots.

[weird-eye-issue]

In our SaaS we have usage limits and rate limits. Have never needed to implement "bot detection" for this reason

[kalleboo]

How do you rate limit a botnet coming from tens of thousands of different IP addresses?

[weird-eye-issue]

For anonymous/free users we have very strict usage limits and the functionality is more limited to only operations that cost us less money. So a very targeted attack would do damage but that is true of basically any system and we could flip on bot blocking in Cloudflare if needed and if that would help

[remram]

Cloudflare's bot blocking uses CAPTCHA... By your own admission, the only reason you don't have a CAPTCHA is that you haven't needed one yet.

[weird-eye-issue]

Again, we have rate limits and usage limits in place. You know that you can pay to have Captchas automatically solved, right? It's not the solution to all problems. Obviously if a targeted DDOS happens then some changes would be required.

Also, that is no longer the case that Cloudflare uses Captchas for bot blocking. That's the legacy mode

[kalleboo]

I always figured that CAPTCHAs worked because they limited on a resource that was harder to steal - human attention.

Rate limit by IP, and you get attacked by a botnet that "steals" IP addresses with malware.

Rate limit by PoW and you get people stealing AWS accounts, or using aforementioned botnet. See bitcoin mining.

Rate limit by CAPTCHA and you have to get a lot more clever (see things like setting up porn sites and proxying CAPTCHAs there)

So while you can pay to have CAPTCHAs solved, you actually DO have to pay and can't just steal your way in, so it means your target has to be more valuable.

[runeks]

> So while you can pay to have CAPTCHAs solved, you actually DO have to pay and can't just steal your way in, so it means your target has to be more valuable.

None of these things you listed above are available for free. They all require either effort to obtain or paying someone to do the work.

[remram]

Someone did the math down thread: https://news.ycombinator.com/item?id=37056504

Unless you set your challenge to many minutes of work, you are not competitive with the human-centric solutions.

[rmbyrro]

Can you steal AWS accounts with no effort?

And keep stealing them after you get blocked on the first ones?

[j16sdiz]

The main goal usually like anti-spam or anti-scraping.

Some shop (for example, concert ticket-selling) have very limited supply and high demand, and don’t want automation in buying.

[ozim]

I see you don’t understand why people make websites or systems. Or why people make bread.

I don’t make application so that users benefit or to make them happy. I make applications so that I can earn money.

Earning money requires having human on the other side. Just like you are not making bread to make bread and throw it into a shredder.

If someone has scheme where automation is beneficial they will create API for their system. You should use API if I provide one. But when I create UI then I create it for people to use it.

[xigoi]

> I don’t make application so that users benefit or to make them happy. I make applications so that I can earn money.

This is why most commercial software is so bad.

[ozim]

And open source maintainers are burning out or writing rants how no one wants to pay.

There is no “non commercial software” that is better even if commercial is bad it is still better than non existing one.

[figassis]

Why not both, make money and benefit people. I think that’s what earning money means. Otherwise you’re just making money at someone else’s cost.

[ozim]

You always have to do software in a way that people will benefit because otherwise they will not pay.

Read again my down voted post and think about the sentence in context of post where "Fice" wrote: "Telling computers and humans apart is a wrong goal.".

Then add to that topic of CAPTCHA and that CAPTCHA is annoying for users so adding CAPTCHA is not beneficial for users so it specific case and discussed in context.