Unfortunately there's way too much of these leeches who charge for stuff that is otherwise free, then use spammy SEO techniques to bury the free options.

As for QR code generation, DuckDuckGo has a built-in generator that's always worked for me. For example: https://duckduckgo.com/?q=qr+Visit+Lemmy.World+-%3E+https%3A%2F%2Flemmy.world