@snow
I had mentioned a couple of good reference articles, about what happened when Gab decided to use Mastodon as their platform and barged into the Fediverse. Copying the links here for reference, specially The Verge article, really good.
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Went looking for some references, I recall reading a really good article describing the situation and the Mastodon developer dilemma on what to do, when Gab appropriated the open source code for Mastodon (which he couldn't oppose, with it being open source) and forked it into their own version.
https://blog.joinmastodon.org/2019/07/statement-on-gabs-fork-of-mastodon/
And some commentary from a page I am still reading, seems a conservative voice but explained with reason : https://reclaimthenet.org/mastodon-blocks-gab/
AHHH -- found the article I wanted to link here, it's on The Verge : https://www.theverge.com/2019/7/12/20691957/mastodon-decentralized-social-network-gab-migration-fediverse-app-blocking