Until AI models on the device will become a standard I really doubt you’ll find a viable alternative, since then it will always be someone’s server you send your pictures to, it’s the matter of who you trust more, a well established corporation which will profit from your content or some shady company/startup that will do the same but in less controlled environment
Yeah but Lemmy is a link aggregator with social media elements like comments and “likes”, it’s more post based than people based, you can’t follow users for example etc, there are fediverse equivalents of Facebook like diaspora or friendica, even mastodon is more people people oriented than Lemmy