Afaik it is a chinees instagram / tiktok alternative

Probably. But then again, if one says “USB 20Gbps”, but the one next to it has “80Gbps”, it might be better to have had “USB 3.2 Gen 2x2”

Why was Lemmy removed from the list of fediverse alternatives?

Lemmy was removed due to:

• reports of how the developers handle certain types of content (post removed, view an incomplete archive)
• the behavior of its creator
• how the sotware itself handles users’ privacy.

Keep in mind that software is by no means “neutral”. The people who make it make decisions about how it works based on their beliefs and goals. That’s why, for example, you can’t quote posts on Mastodon (at least for now), but you can do so on other fediverse platforms.