There are going to be a ton of accounts on the fediverse "NOT ALLOWING QUOTE POSTS"
RE: https://mastodon.social/@_scl/115226178076029902
The Quote-Post opt-in is a Mastodon concept. It is NOT a Fediverse concept.
Misskey, the Misskey forks (ex: Firefish), Pleroma, the Pleroma forks (ex: Akkoma) — have not only supported quote-posts long before Mastodon did, but — they don't care about Mastodon's opt-in.
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The millions of accounts that Mastodon has defaulted to not allow quote posting will only be effective with other Mastodon servers.
Other parts of the Fediverse won't care.
If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/reiver/statuses/115226374667279709 on your instance and quote it. (Note that quoting is not supported in Mastodon.)