sometimes I do this but very rarely in roulette games or Crazy Time but when the budget is only around $5 remaining and my reason for going all in is not to recover losses but just to try my luck on the remaining budget I have.
even though this is legal to do, in my opinion it is not recommended for anyone to do this if they are not prepared to lose the remaining amount of the budget they have and it is better to use the remaining budget to bet the next day.

maybe I've forgotten a little what the best amount was when I went all in, but as far as I remember in the CT game, I bet all in on the bonus and got a multiplier of around 25x.
but lately I rarely do it because I'm a bit busy with real work so I rarely access casino games.