Yes, he purposefully made it not strong enough. Its extremely easy to detect if collusion is happening or not. Its called common sense. if you see the same 3 players all playing together at multiple tables at a time, THEY ARE COLLUDING!
ITS NOT A MATTER OF OPINION.
Frankly I hope he serves time for theft and fraud.
No its not always easy to spot colluders. I guess the playing style can point out towards it, but as a player sitting on the site, it is very hard to point to a 100% colluder.
Its easy for me. And since its my money, I choose not to play at tables that have a 50+% chance of being dominated by colluders.