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> some mainframe customers have virtualized thousands of "your personal domain and web server running php/perl/nodejs”

Are there hosting providers offering this type of service?

that was around 2010/2012, eg page 15 here

however virtualization on arm and Intel has meanwhile matured enough to replace that business model.

IBM Cloud offers Z systems: https://www.ibm.com/community/z-and-cloud/ I imagine they're absurdly expensive like the real hardware.

Only available for existing Z/OS sites via your organization rep.