As long as you're transparent decentralization does not matter.
Tether is extremely centralized since accounts can be frozen at will, putting people's funds at risk. USDC also does the same thing. The only decentralized alternative to such stablecoins is DAI. As far as traditional cryptocurrencies are concerned, we could say the most decentralized coin in the world is Bitcoin. Ethereum is decentralized as well, but not as much as Bitcoin is. The past events of the "DAO hack" where the ETH blockchain was "reserved", tells us that Ethereum is a little bit centralized. Not only that, but Vitalik Buterin has strong influence over the project. Bitcoin has no leader, so it's much more decentralized in this regard.
Unfortunately, most people don't care about decentralization these days. They prefer convenience/ease-of-use on top of evertthing else. As long as this is the case, centralized coins will continue to rise like there's no tomorrow. I wouldn't worry about this as long as Bitcoin stays alive and running for many generations. Just my opinion