This is a valid concern although I would point to the fact that because Bitcoin and lightning is permission less and open, a centralized player can't take advantage of a monopoly on transactions. If it became censorious or too expensive, a competitor would come take their place rather quickly, thus leaving no incentive to do so in the first place!

It's really amazing tech. People are simple. They respond to incentive. I'm already thinking about making something similar to zaps for the Liquid Network.

You could even do stuff like badges as assets on liquid for instance. Will that be useful? idk, but why not build it and see.