the bonus is -EV and if someone used it for hundreds of times he will still be losing money , I really can't see any harm done by this player unless there is something missing that he is not telling ?
It is EV- but the players tend to take advantage of the bonuses with many accounts so as to abuse that high multipliers on their dice - an example. So the number of time they could bet increases and thus they do have a higher chance of hitting it. When (
it gives them more bets yeah indeed , they can spend more hours wagering I agree as well
but how is this considered abusing ? how can you abuse something that you can't profit from ? if players keep "abusing" this way , FJ will just get richer and that doesn't look like an abuse to me

if that user was benefiting from the sports welcome bonus then yeah that would be an abuse , but he can't abuse the casino bonus