Why do you think the lack of time limits is an advantage?

There is an amount of time spent gazing into your navel which is helpful. Less or more than that can be harmful.

You can absolutely make yourself mentally ill just by spending too much time worrying about how mentally ill you are.

And it's clear that there are a rather large number of people making themselves mentally ill using OpenAI's products right now.

Oh, and, aside, nothing stops OpenAI from giving or selling your chat transcripts to your employer. :P In fact, if your employer sues them they'll very likely be obligated to hand them over and you may have no standing to resist it.