Please calm down. The example machine that I gave (IBM 5140 Convertible) does not use buckling springs. And it seems to be a highly desirable keyboard because of the switches and the form factor.
The long story made short is that when people start crawling around looking for cool keyboards, switches, or keycaps, often a system is ruined. And especially if we are talking about Geekhack .. there is a lot of keyboard poaching that is going on there. To say otherwise is pretty laughable.
A dead keyboard? Sure .. a physically broken keyboard? Take what you need. I just get really PO'ed when I see this:
https://www.ebay.com/itm/252582546461
Some damn poacher stripped a laptop of it's keyboard, took the keys off of it, and then sold the carcass for the switches. It's not like laptops come with backup keyboards. It happens way too often on eBay, and this handy "howto" guides like this are part of the problem:
https://deskthority.net/workshop-f7/ibm-5140-convertible-conversion-t9666.html
And here is a GeekHack post featuring harvested 5140 keycaps .. beautiful work, but another 5140 gave up it's life for it.
Hopefully for this particular lot of machines nothing bad happens. But keyboard poachers are a real problem.