1. If you want to achieve 100% anonymous, you wouldn't use Metamask since it's a wallet that used to hold centralized shitcoin that will harm your privacy.
2. If you want to achieve 100% anonymous, you wouldn't use less decentralized swap platform and centralized exchange!
Trading - This is where you are going to buy a coin in an exchange like binance or use uniswap, metamask to buy, sell coins.
3. There's no relation between Metamask's new policy and the increase of shitcoin price, actually anyone must hold their coins on hardware wallet if they want to hold for long term.