An immutable distro, probably Fedora Kinoite https://www.fedoraproject.org/atomic-desktops/kinoite/

>In windows when a child goes searching the web for a “movie maker for windows” they are going to be in a world of hurt either finding expensive commercial options or super scammy sites promising the world.

It's funny that you use that example because the state of video editors on Windows have never been better from industry standard free options (DaVinci Resolve) to FOSS options (KDEnlive, Openshot, Shotcut, Avidemux etc).

What you describe is a Google / web / browser problem not an OS one