I'm not sure who is pushing #GlobalSwitchDay probably won't amount to anything, some of these platforms are certainly not ready a massive migration. The #RedditMigration was rough enough on Lemmy, it actually murdered #Kbin; #loops #PeerTube and #Friendica don't have nearly enough well-maintained instances to support any sort of massive migration. And Signal, well its better than WhatsApp, and its mostly Free Software, but it doesn't really align with all of the others that are, or at least intend to be in the case of Loops, federated services based on ActivityPub.
naw, Bluesky users have already turned down mastodon. Lets pick another one they haven't heard of yet Bluesky->Misskey
Or you could do all of the above ->Nostr
I like the idea of Nostr, but it’s filled with way too much cryptocurrency garbage.
I and lots of other people are actually using both platforms. That’s why apps like Openvibe exist.