A centralized stablecoin paid to your custodial PayPal account is insignificant and won’t have any meaningful impact on the adoption of actually decentralized cryptocurrencies. We would all like to see platforms like YouTube embrace Bitcoin, but this does not seem like a step in that direction.
They are only limiting this to the United States, where stablecoins aren’t really necessary because there are a lot of payment options that work well, and they are using a lesser known stablecoin, instead of USDT or USDC. It almost seems like it is designed to fail and then they will use this as an excuse to never adopt any crypto, including BTC, on YouTube and other Google services.