In my opinion, the advantages of these platforms will far outweigh the disadvantages - provided that the abuse of power can be curbed (opaque algorithms that present fringe positions to a large audience, censorship by the owner, etc.). Regulatory measures are needed for all actors: rules for algorithm transparency, audits. If disclosure or audit fails, platforms can continue to be accessible but must shut down algorithms.

I use calendar.online and it worked very good for my purposes, nice intuitive UI

I’m eager to see how the clown expects to ever be trusted again - randomly cancelling his own and ages old treaties at will or using threats to do so for “negotiations” (not to speak threats of annexation of former allies), what’s left for positive diplomacy once he comes to see he needs it?