Not OP, but it looks like they are using texlab for completion: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#texlab
Apart from that there is https://github.com/lervag/vimtex with file type support, document compilation, etc. For grammar checking I use https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#ltex and for snippets https://github.com/L3MON4D3/LuaSnip. See https://github.com/iurimateus/luasnip-latex-snippets.nvim for latex snippets and what you can do with them.
The good old “Think of the children” argument again… This is an attack on online privacy, again. I hate it.
It is the parents responsibility to keep their kids safe. We don’t ban knives either just because a child could accidentally get hurt by one. And apart from that the regulations are not even well thought out, they will not stop a determined teenager with a lot of time on their hands.