Opinion on referral programs, positive or negative?

Most forums generally have a negative view of referral programs, and I just don't quite understand why yet but still when I was searching for other sources of income for this December period...knowing how expensive this time of the month usually is. Anyway, I just have to ask, is it a good idea to go into it and if yes, can you check if this is a good one https://www.bitget.com/support/articles/12560603820056 because this was the one that initially attracted me or do you have other ideas?