Too true.
If you are uncomfortable with your Mastodon posts ending up on federated social media platforms you never heard you can make a comment supporting this feature request:
I feel the same with Mastodon instances. I have joined many and use primarily 3 to get a different style of content:
1. my "home" instance with a hodge-podge of topics
2. my "entertainment" instance with mainly TV, movies, and music topics
3. my "food" instance where most posts involve food, recipes and coffee.
When I boosted this post @PleaseCaption flagged for me that there's no #AltText on it:
>Blind and/or partially sighted people may have trouble with the toot you boosted ๐คณ
>
>The author can delete and re-draft. Or, edit, remove and re-add media, and add captions.