Tadaaa ... we have #quotePosts on #Mastodon beginning on the big Mastodon instances! (available in Mastodon 4.5 for other instances soon).
And it's great how you can protect your posts if you don't like to be quoted: globally and even per single post. By default it's for followers only. If you want to allow quote posts for everyone, you have to change that (alt text).
Here's a #HowTo by @Mastodon https://blog.joinmastodon.org/2025/09/introducing-quote-posts/