[chongli]

Also, inserting hidden or misleading links is specifically a no-no for Google Search [0]

Depending on your goals, this may be a pro or a con. I, personally, would like to see a return of "small web" human-centric communities. If there were tools that include anti-scraping, anti-Google (and other large search crawlers) as well as a small web search index for humans to find these sites, this idea becomes a real possibility.

[maxrmk]

It’s easy to opt out of being indexed by Google.

[cdrini]

Exactly. Identifying crawlers like Google, bing aren't the issue. They obey robots.txt, and can easily be blocked by user agent checks. Non-identifying crawlers, which provide humanlike user agents, and which are usually distributed so get around ip-based rate limits, are the main ones that are challenging to deal with.