I got the same email as that, just in another language. You mention nowhere that the JP can't be won with the free spins, and you almost present it as it can.
The honest way to write it would be Hello Subscriber. Today you'll get 30 Mega Fortune spins on deposit, that
you can't win the jackpot with.
I always read the TOS of bonuses(unless I trust the casino enough to know they won't come up with any BS), and thats one of the reasons why I haven't played at Casumo in ages. I prefer to take reload bonuses when I play, but with your WR-structure of 25x(bonus + deposit) the WR on bonuses from 50% and down gets horrific. 75xB for 50% and 130xB for 30%. Thats pretty bad when you compare it with the other casinos here that usually have a WR in range of 30-50xB on all their bonuses. But that is of course up to you
The other reason is that I reported an issue to your rep here probably half a year ago(I think it was another guy manning your account then), but I never got any feedback on it. The problem was how your site showed big wins on some of the WMS games even before a feature had started. Now that doesen't matter to me anymore as I can't play WMS games anyways