Actually, Celsius, Terra, FTX crashes all prove that if you don't do self-custody, you're going to pay it sooner or later. There are two kinds of centralized exchanges; those that have been shut down, and those that will. You wanna buy the shittiest coin, hold it, and hope to become rich one day? Go do it, but for the sake of you, hold your keys. If there aren't available methods to do it, start questioning the specific altcoin's growth.