...I try to make some profit when I find a chance, but I try to avoid these projects because I do not know much about what they are going to do, they do "promise" a roadmap, but how would I know if they will actually do it or not, and even if they do, then how would I know if people will react good or not when they do. This is why it's better to avoid them in the end.
I think there shouldn't be any problem if you lose a few dollars on the Polygon zkEVM network for performing multiple transactions. But in this case, you have a small chance to get an airdrop if the project team decides to reward its early participants in this way. If you decide to save these few dollars, then you definitely will not have any chance of airdrop.