DC tours are probably a nightmare to do in a PCI-compliant (and the myriad other standards they claim compliance with) environment.

Yeah, but draconian laws aside (I jest a bit) if you can ensure safety for kids (and clumsy adults) visiting factories and NUCLEAR plants I guess you could manage the same for data centers and deal with a reasonable number of headaches.

It's not really too complicated, iirc. They already generally have visitor processes set up for customers and prospective customers.

The servers themselves are in cages, of course, and presumably the tour wouldn't actually go into those. Plus, yeah, what the other comment said.