I mean fair enough, it's better to expose your IP to one VPN provider than to blast it to thousands of peers, but the trade-off of recommending free VPNs to people who aren't tech savvy (especially when it sounds like there aren't any legit ones that support torrent traffic), is you're inviting them to find a shady one somewhere thinking they're being safer and risking getting MITMed or their login tokens stolen in transit trying to browse the internet while they're downloading something.

I would just consider paying a few bucks for a VPN to be a hard constraint of using torrents even somewhat safely.