This is rogue and i see no way you do not lose your accreditation once the admin comes along.
Some casinos do have this but do no apply it unless it is noticeable. I have played at betsson doing $2 bets and then lower to .80 and it was fine. When I asked about it they said it more applied if I was doing $5 and then lowered to 50 cent. Which I still think is BS.
Some people like to mess around and bet a bit bigger for awhile example betting $2. And then go back to their comfort zone. You really going to take peoples winning because of this?
Be a good casino. Give the player their money and change your terms. I see this as your only out to not lose complete respect. Its not caving or pride, its the right thing to do.
Losing accreditation over this will never happen. I've once questioned about the rogue-ish terms of one another accredited casino, which I can't remember right now. I believe I was told by the Meister himself that the bonus rules of a casino do not affect whether the casino gets accredited at all.
Also this thread clearly proves that most of you never read the T&S at casinos. This rule about halving your bet is nothing new. I've seen it countless times, and it's a rule I more or less expect a casino to have. Even if the terms don't straight out say the specifics of the rule, every casino usually has a rule about reserving the right to void winnings if they deem your play "irregular". Playing like this would classify as that. Therefore whenever I play at casinos I fully expect them to use this rule against me if I play like this.
I too sometimes raise my bet from the lowroller zone to try few spins on a bigger bet. Sometimes I get lucky and win. If it's a massive win I'm not just gonna drop back to 0,20 from 2. Instead I might drop to 1,50, and after a while drop to 1 .. never got into trouble this way.
Though I do still sometimes wonder what does classify as "significant increase" in balance, and if winning such sum means you actually can't ever go back to low bets. What I described above is what I'd do but whether I've got lucky or that's actually allowed I do not know ..