Yeh party doesn't need to use robots or have their own 'players'.

Party poker is fine, I play there a few hours a day and know plenty of others who do the same. I don't their RNG is 100% random (I don't think any RNG truly is), but it is close enough and deals a fair game. If something doesn't go someone's way, it's easy to cry rigged instead of realizing their own bad play, or that 99% winners do sometimes lose.

"If someone seems to be too good then you can always leave the table and find another."

Robots aren't very good and nothing you should be worrying about. If someone is playing very well, then they're almost certainly just a very good player.

"as they have 20,000 people online at any given time, often a lot more."

Had over 75k on yesterday, what a goldmine.