At this point, why don’t the companies who run Chrome derivatives work together to build a fork that evolves separately from Chrome? Edge, Vivaldi, Opera, etc. will never get the marketshare on their own to rival Chrome, but together, they could make a dent with a unified browser engine.

I imagine it has to do with the lack of heads up from Reddit. If the app makers had been given six months before needing to pay huge fees, they could have incorporated other sites and transition their users to alternatives. But they had ~30 days notice and would need to shutdown on July 1 and open again when they can support lemmy.