There are a lot of servers outside the pool the run. I run two of my own
a some instamce of the same code, nit different implementations
That is true... Fixable though, but it will cost a lot of development time
fixable by real adoption, we will se if it will ever happen.
Probably not. Even Signal is a tiny percentage of WhatsApp. But let's say Simplex does eat a significant percentage of the market and remains open. What is the incentive for a group to invest millions into building alternative but feature wise identical implementation? More likely there will eventually be forks to implement things core won't