[spearingthehead]

It's especially worse when they are required by TOS to not engage in communication with bidders/clients outside the platform.

This would be like, for example, if you set up a job interview from a listing at Indeed, and then Indeed demands that you do not use regular email to stay in contact with the employer, you must use their own messaging system. And you can't even voice chat elsewhere unless it's a link that is provided by Indeed so they can be aware of it.

Just the walled garden aspect of freelancer websites is what turns me off.