Bybit has been such an exchange. It's being shilled by many known social media influencers (sunnydecree, themooncarl, ivanontech....) which is kinda sad to see because they only care about their payment from Bybit.

As said above, it's mostly done by gambling sites to tempt poor souls to gamble more what they can afford, because you will lose in the long run. It's nothing new or groundbreaking, but people still think it's a viable income method.

Overall, I would prefer to look into technical analysis or some other fundamental investment metrics that make a coin a potentially good investment. Much better than hopping from one site to another for a bonus.