10-20x doing it on 1.01. If someone from rollbit see its as an abuse, then its an abuse. It probably depend on who is managing the casino. Lets just say its under new management and they noticed your account doing all these to rank up and get benefits.
I'm wondering how you relate this where the casino got your info from Stake. Did stake also locked your account and now its rollbit doing the same thing? IF this is the case then you really have done the same abuse.
I personally do not see it as abuse at all. If they do not want players placing those types of bets, then they shouldn't offer them. A person can just as easily lose that bet, so they can ask for a refund if it loses? Obviously a casino is not going to refund your bet if you lose, but saying a player is abusing them for betting x1.01 is kinda crazy IMO. They should either remove those bets or disallow them to count towards promotions. Solves the issue.
There are many casinos which have odds like those that do count toward the level up and bonuses as well like 1.03 to 1.10 count toward leveling up in most casinos.The casinos should clearly state that these type of bets do not count toward the promotions just like Stake for example makes it clear in the Level up or slot challenges that they do weekly,they say explicitly that buying the bonus will consist a max of x5 multiplier even if you win a big multi on the bonus round,so you have to play normally in order to go for the promotion prizes.
The same for sport bets,the casinos should be clear,Rollbit in such case should have offered a much more professional explanation as this is bad to their reputation.