Lots of languages are typeless and the standard library is weak because web (NodeJS is good but npm is shit)

All of those things are by design and comparing JS to a fully fledged OOP language is just the sign of a clueless developer.

The JS standard is well defined and compatibility has nothing to do with the language itself

This is a problem for any web application. There are many solutions, none are perfect.

On some sites (like 4chan) you’re required to solve a captcha every single time you post, unless you pay a yearly fee not to.

To avoid it, you would need people actively monitoring, banning, and setting up bot detection patterns.

Then again, there are cheap services online where real people are hired to create human accounts and spam you anyway, so…