Don't use random "free" QR code generators online, make sure to use a non-redirect link QR code generator (Linux has a few, if you're into LInux).
Last year, I ran into someone's YouTuber/TikTok vehicle with a QR code plastered onto it for their channel, scanned it, and it was "YOUR QR CODE HAS EXPIRED" - QR codes DO NOT NEED A SUBSCRIPTION.