You deleting your posts from your own instance doesn't magically delete them from every other instance.
Seems to be standard functionality according to this:
https://fedi.tips/how-do-i-delete-a-post-on-mastodon/#:~:text=There%20are%20actually%20two%20delete,make%20changes%20and%20repost%20it.
According to the same article it can fail if the server is malfunctioning. But I would assume only rogue servers would do this intentionally...like suddenly kick all users or a particular user out and lock them out of their delete option.
You deleting your posts from your own instance doesn't magically delete them from every other instance.
Seems to be standard functionality according to this:
https://fedi.tips/how-do-i-delete-a-post-on-mastodon/#:~:text=There%20are%20actually%20two%20delete,make%20changes%20and%20repost%20it.
According to the same article it can fail if the server is malfunctioning. But I would assume only rogue servers would do this intentionally...like suddenly kick all users or a particular user out and lock them out of their delete option.