I think your misunderstanding is believing users are locked into a crypto system if its implementation is controlled by a small group. They are not - if the developers abuse their power, users are free to migrate elsewhere and take their funds with them (in fiat value or as a different coin).

That's different to e.g. PayPal where your funds can be locked and there's nothing you can do.

Decentralized control over name, logo, features or code of a crypto coin is extremely hard to impossible, if only because there aren't too many people alive that can discuss core crypto features with any meaningful knowledge (I know I can't). Some coins do have governance features, but none of those have profited very much from that.