You will have to ask the casinos if you face something like this in the future. We have seen several scam accusation threads where people complain because they got limited due to value betting. The casinos consider them as value betting and limit the players. There is nothing mentioned in the TOS about value betting, but the casinos can limit your betting ability if they want.
Even if you plan to check a casino, I would always recommend placing bets on higher odds and a minimum of $10 bets. This is just friendly advice. Also, not all the casinos follow the same method. But it is better to stay on the safe side.
They can limit your bet value at $2 as a minimum value but if you try to set a bet with value under $2, you will get an error as I think. There is no consequence like they will suspend or terminate your account by try to enter bets with too low values under $2.
They can answer the community question about this, and clean uncertainty in the user community but without account termination consequence, there is no severe issue. In addition, small bet values can be different in different games on a same casino. It's their homes, and it's their rules.
Sometimes I see casinos run their contests in the forum like multiplier contests and they possibly give users special offers with min bet value is smaller than usual. Again, it's their contest, it's their rules.