There are two ways:

• Just like the game stop setup, keep pumping one coin and watch the reaction, some exchanges are honest and won't try to stop you, others will behave like those wall street fuckers.

• A better approach is the exchange runs, not your keys, not your coins. Just like a bank run everyone withdraw all their coins at the same time. If the exchange is honest, they won't try to stop anyone, if they're dishonest it'll be like game stop allover again.

In the end, crypto also has decentralized exchanges which would be preferred over any centralized alternative, can't cheat on a smart contract.