The amount of free bets Crown Bet give out is pretty that good being said, i had a 4 X $50 bets when i joined (always good to have the option of being able to split your first deposit bonus bet(s) up) and they emailed me an offer for more free bets on a second deposit. So yea, 8 free $50 bets in the space of 2 months, even with the turnover requirements at least they are giving you a good chance to build a bank.
Ive had plenty of cash back/ free bet promo $50 bets with them as well. I think they are easily the most generous when it comes to giving them out and the easiest to obtain as a refund for a losing bet, well, at least since i joined up with them they have been. (about 6 months ago)
I dont think ive ever got a bonus bet deposit offer off any of the others after my intial deposit with them.