Wikimedia could pay, they have an endowment of ~$144M [1] (as of June 30, 2024). Perma.cc has Archive.org and Cloudflare as supporting partners, and their mission is aligned with Wikimedia [2]. It is a natural complementary fit in the preservation ecosystem. You have to pay for DOIs too, for comparison [3] (starting at $275/year and $1/identifier [4] [5]).

With all of this context shared, the Internet Archive is likely meeting this need without issue, to the best of my knowledge.

[1] https://meta.wikimedia.org/wiki/Wikimedia_Endowment

[2] https://perma.cc/about ("Perma.cc was built by Harvard’s Library Innovation Lab and is backed by the power of libraries. We’re both in the forever business: libraries already look after physical and digital materials — now we can do the same for links.")

[3] https://community.crossref.org/t/how-to-get-doi-for-our-jour...

[4] https://www.crossref.org/fees/#annual-membership-fees

[5] https://www.crossref.org/fees/#content-registration-fees

(no affiliation with any entity in scope for this thread)