No. Multiple sites fragment the userbase and disunite the community. There has to be one uncensorable open-source site.
It's just a protocol. You could run a full node for a few bucks and see for yourself memo is honest. Btw, memo.cash is providing tx id so you could verify it on an explorer isn't it?
Just a protocol yes, but there still has to be one site everyone goes to on the frontend that is the default. I.e. the Twitter of #crypto and the best solution will win.