GameStop has fundamentals. But you're free to ignore them; they're not hurting anything. GameStop has everything Bitcoin has, plus some extra things; it is therefore worth even more than Bitcoin is.
Said another way, it is nonsensical to claim that Bitcoin has no fundamentals. If you believe that (1) Bitcoin has "no fundamentals"; and (2) GameStop has fundamentals tethering it to a market capitalization of a few million dollars, what you're actually saying is that Bitcoin has fundamentals tethering it to a market capitalization of zero dollars.
Including the ability to keep making losses in perpetuity, which would make it worth negative infinity.
I'd say this is very unlikely, but it's not beyond the realm of possibility that GME becomes like a TSLA or AMZN that is constantly trying to catch up to the absurdly high expectations of investors.