If you want to develop mobile apps and you want to have users, there is no way around vendor lock in and walled gardens. By supporting Android, too, the only thing you’ll achieve is that you’ll be the abused in two abusive relationships instead of one.

Adding more abstractions on top will not significantly improve the fact that you are at the whims and mercy of companies that don’t care about you, so I don’t see RN as an improvement.

If you want to avoid vendor lockin, don’t do mobile apps, go to web. Then, you can also just switch RN to React simply or any other framework.