Re. the bonuses:
They hand out unrealistically large bonuses (not all of RTG, this group in particular, it’s their business model as they explained here at another time).
These bonuses make it impossible for players to cash out because they always have a wagering requirement hanging over their heads.
At the same time, RTG deducts bonuses from affiliate income directly, so you have abnormally huge deductions from your pay.
If you do well with them, you should give the love to world club and see how much better you do over time.