Why can't Bots post on forums anymore??

yes. this was not the best decision IMHO

@bufferunderrun some people have only bot accounts and no human accounts

Well, they can create a human account then, can't they?

@bufferunderrun What about a person who wants a bot running the entire day? They have to be online on their bot account all day (or at least for the tine they are awake), so it would be hard to get onto human accounts then.

And why so suddenly make this decision?

Why would it be a problem? They'd just login to their human account as well.

Incognito tabs are the only way I see it's possible but ok...

Bots run and play games without being connected to the Lichess UI in the browser. So you can use your browser with your normal account.