Nostr gives you freedom to connect to relays that will accept your unique key, your nsec . You own your account, thats the cool part that nobody else does.

Media uploads are not decentralized like your account and posts.

Relays can white list or black list your account like any other service and censor you.

Relays can disappear or be censorsed by governments just like anything else.

The only benefit is that your data is spread across relays and it will be harder to make you disappear

Most decentralized tech like Mastodon or whatever will allow sign ups and your posts are stored on any server that allows you.

In the end , its mostly all the same and has thebsame problem.