The data is publicly stored on [publicly accessible servers](https://atproto.wiki/en/wiki/reference/core-architecture/pds https://atproto.wiki/en/wiki/reference

The data is publicly stored on [publicly accessible servers](https://atproto.wiki/en/wiki/reference/core-architecture/pds https://atproto.wiki/en/wiki/reference/core-architecture/pds) so you can indeed do whatever you want with the uploaded media on BlueSky as well. Not to mention that if you care enough about this issue, there are numerous alternate clients to access BlueSky.