In my experience, with C2H you typically earn more in the contract phase than you would with a base salary, which is helpful in covering benefits or out of pocket expenses. Maybe that's not always the case, but salaried employees usually earn 80% or less what their contract counterparts do.

And you kind of have to bomb the contract phase to not be given the offer, unless there are other circumstances at play (budgets, pandemics, etc). Hang with the team at lunch or after work if they do that, make code contributions asap, and be the kind of person any team would want to have.

C2H usually just makes it easier for them to drop you if you're (surprisingly) not a good fit - and after that kind of time and money investment, they definitely don't want to do that.