Yes, stablecoins can be blocked -

stables.rip — On-chain stablecoin censorship tracker

Real-time tracking of frozen stablecoin addresses across Ethereum and TRON. USDT and USDC freeze intel, wallet checker, and censorship analytics.

What they need is #Bitcoin Freedom Money.

They are 100% under surveillance and will be blocked. They will learn that lesson the hard way. Then will figure out why Bitcoin is really the only option