Duolingo keeps doing mass layoffs, so the bird is overworked. You can help him out by switching to a language learning app that actually helps you learn a language instead of endlessly throwing flash cards at you without teaching you anything! Win win.
I feel like a lot of this is driven by a bias towards the unknown. You don’t know all the security issues in something new or even something old that doesn’t get the same level of testing as Linux.
I would trust security hardened Linux over all of the suggestions any day of the week. Better the devil you know.