[sametmax]

Some of the services I make have "private urls" and/or a cookie containing a token to auto-login you so you can use it without an account. But it works only if:

- the data are not very sensitive. It's very easy to mess with.

- people are tech savvy enough to understand what a URL is or never get in a situation where they don't have the cookie

- your service is too small to attract spammers

- you can setup a decent system to prevent bot from creating accounts

It's hard, plenty of gotchas, and just satisfied a minority of privacy-minded users. Though to sell.

[chii]

I don't get why no service use the email link to login method. It already exists, but is marketed as 'forgot password'.

[icebraining]

What would be the point? You'd still have to create an account and give out your email address.