@halcy @david And so it came to pass.
"On December 15th, ... On the following day, Twitter began to flag all Mastodon links as malware, preventing Twitter users from sharing them. Media coverage of the bannings included an erroneous report of an account for "John Mastodon" (a misspelling of @joinmastodon) being banned, described as "founder of a competing social media company named after himself". Mastodon users wrote fictional backstories & memes about "John Mastodon".

https://en.wikipedia.org/wiki/Mastodon_(social_network)#2022_Twitter-related_spikes_in_adoption