Regarding cashing out, there are always people bragging about Hong Kong-style exchanges. You go to cash out one million Hong Kong dollars, and they just run away.
Whale-level cashing out is directly done by Tether on-chain to destroy and exchange for fiat currency. To cash out, you must first have assets; if you have assets, why worry about cashing out? For ordinary people, there are only two ways to cash out:
1. Find merchants with a verified identity who have been trading for more than three years on Binance Shield.
2. Use the Siren Exchange to transfer to your own overseas bank account.
Everything else is just a waste of effort.