I had several small requests for moderation (deleting and banning spammers posting spam/crypto scam issues/PRs in my repos and ones I contribute to) answered within a day earlier this year after more than a decade of never needing to request moderation. I'm not defending GH here as it's obviously unacceptable that the OP's issue took this long, but they definitely do or at least did have mods. I would guess they need a lot more of them if something this serious went unaddressed, or maybe the ones I interacted with are now gone and have not been backfilled.