i guess i am a little confused, what problem exactly are you worried about that makes you think we need to delete these accounts? Just that they are irritating? Or some other broader issue?
45,000 sounds like a lot but iNaturalist is … really big now. That’s less than 0.1% of the observations on the site. And they shouldn’t show up on the ID help page, nor range maps.
There are certain situations where the problem is more severe, in particular ‘duress users’ amongst school groups, and i think the ideas discussed about improving that situation would also help here. See also https://forum.inaturalist.org/t/duress-and-contest-users/422 and others.