I think USAF and other companies were likely part of the reason Sony removed Linux support. Generally, a PS3 was a lot cheaper than the equivalent PC/server.
Sony typically sells consoles at a loss and makes profits from the game sales. The likes of USAF, researchers, and other companies were buying PS3s in bulk, and using OtherOS functionality without utilizing the primary use of PS3s: games. Often these projects didn't need any GPU power, and OtherOS had nearly full access to the CPU (iirc it had access to the main PPE and 7 out of 8 SPEs). Thus, Sony likely was not making enough money from the consoles USAF et al. bought.
IMO that is Sony's problem, selling special purpose hardware that could be general purpose but locking it down so that your business model is secure... after the point of sale... seems a bit sneaky.
I enjoyed many hours of gaming on the PS2 and I bought it (in part) because I would be able to install Linux on it. I still managed to become a Linux guy today, in spite of the rug by Sony, and I suppose there's nothing overtly wrong with clarifying with an update that the primary intended use of your product is in fact its primary intended use, but as a hobbyist (dang it, now I've gone and done that again)...
There was actually a class-action lawsuit about this, but Sony played a lot of games to keep the rationale for locking out OtherOS out of the discovery process. It wound up being just another one of those kinds of settlements - i.e. a large-sounding number being awarded to so many plaintiffs in the class that its basically pennies per person.
My guess is that they don't want to say the quiet part out loud: i.e. they took away OtherOS because they weren't getting the tariff exemptions they wanted and they don't actually want people using these devices for non-royalty-bearing activities (e.g. piracy and homebrew).
Sony loved those labs. They were pushing an idea at the time that it was legally not a game console but instead a general purpose computer, which helped them with import tariffs in a lot of jurisdictions. It's also great marketing. "You can have the power of a super computer under your TV".
As fun as things like that are, AFAIK most of those types of PoC exploits are done using SOHO printers. There are two specific cases I am thinking of, one where a pile of extremely confidential data was captured by pulling documents that had been sent to a printer for printing or faxing; in that case it was an insider who was copying docs they shouldn't have access to. In the other case it was a pretty nifty attack where the attacker was able to pivot using credentials taken from a printer to access other systems.
There are also several publicly available tools that can be used to pop printers, and use them for other bad things, but it's not an area I have spent much time in other than from a blue team/IR perspective. Printers, like alot of other hardware, are usually poorly maintained, but at least patching has mostly gotten easier and most infrastructure scanning tools will report vulnerabilities and weaknesses in them now.
Sony typically sells consoles at a loss and makes profits from the game sales. The likes of USAF, researchers, and other companies were buying PS3s in bulk, and using OtherOS functionality without utilizing the primary use of PS3s: games. Often these projects didn't need any GPU power, and OtherOS had nearly full access to the CPU (iirc it had access to the main PPE and 7 out of 8 SPEs). Thus, Sony likely was not making enough money from the consoles USAF et al. bought.