hell the living computer museum in seattle, before it's at least physical closure by the sister of paul allen, is/was a bit like this. They have a bunch of vintage big iron that they have restored to working condition and allow members of the public to use. Some of these are still available on the internet.

https://www.livingcomputers.org/

https://www.livingcomputers.org/Computer-Collection/Online-S...

Hell deep in the chip shortage I talked with more than one person that were buying up electronics at thrift shops and ebay that they knew contained chips they could not source at the time.