Can't really complain if they offer Spotify Family which gives you 6 separate premium accounts, I think it's only double the cost of a normal Spotify account.
I have two children, myself. I just installed second account on an old phone which has no SIM card in it, it has all the kids playlists and I don't have to worry about them getting recommended any of my 90s thrash metal. :)
(and I am back to caring for my own mp3 collection again and use spotify only for rare and new stuff)
Come on, guys, I'd expect better from HN than complaining about features which already exist.
https://community.spotify.com/t5/FAQs/What-is-Private-Sessio...