Signature campaign earnings that I received are being hodl in the account. I don't use it cause I prefer it to be the money for my emergency needs. I will only convert it to USD if I really need it, and if I need something which is essential to my life as a student, I use my other jobs earnings.
I don't think you will be forced to bet the money you make from a signature campaign on gambling. However, sometime someone is very inconsistent with his method, because he is too close to gambling advertisement, so that sometime he also intend to double his money by gambling. It is normal human nature because they can never get enough of what they get.
If you just want to use all the money you currently have for your daily need and education, then don't gamble and may not be interested in gambling. That is the best advice for you I think.