Yes Aniyomi is safe to use.

You may also like saikou. It has fewer sources compared to aniyomi but it's a good app, especially if you prefer to use anilist.

If you mean Tachiyomi, then yes, absolutely safe

Yeah Aniyoma is perfectly safe. Its just a rewrite of Tachiyoma, both Aniyoma and Tachiyoma have their source code publicly displayed as well.

Don't know about aniyomi, but I've used the base tachiyomi for years with no issue.