I wouldn't advise thinking of it as "providing infrastructure IT services to cybercriminals", as if these people are primarily IT people, running primarily infrastructure, who just happen to favor this audience.

I would rather advise thinking of these efforts as various cybercriminal groups going through the schlep of setting up their own backend IT infrastructure for their own use (because they couldn't find anyone to host them); and then, with built infra in hand, either:

1. realizing that their own needs were emblematic of a more-general unmet market demand for "don't ask, don't tell" hosting, and so branching out into hosting as a secondary business;

2. taking the charade of a hosting company they made up when e.g. registering for an ASN, and deciding that the more real they make that charade, the more it protects them; and so slapping together a facade of a hosting site (that serves no real customers and has no real control-plane);

3. or deciding that having real customers with actual legitimate traffic coming from their ASN further legitimizes them (and makes other ASNs more wary to just block them wholesale), and so actually standing up the facilities of your average VPS provider on some single sad box somewhere — probably running some turn-key IaaS appliance (usually not OpenStack, more likely some shoddy old thing they bought on a cybercrime marketplace);

4. or (and I think this is the most common route) chatting with cybercriminal friends of theirs, and those friends hitting them up for hosting when they realize that they've actually built something out for themselves; and this gradually just evolving into a de-facto hosting arm of the business (as they accept more of these "high-touch" word-of-mouth customers; eventually begin to feel burdened by manually configuring their systems to accommodate these customers; and so begin to automate things.)