I can't say for certain why they can't use GPLv3 - just that no company I've ever worked for (n=4 since GPLv3 came out) - will allow it on premise. It's probably why Apple stopped updating all their GNU binaries, and you have to sideload stuff with brew to use anything released in the last 10 years.
If I had to guess - The patent rights clause weirds out a lot of lawyers. Obviously anyone who works with hardware doesn't like the anti-tivoization clause. Another possibility is the AGPL (which IS lethal for obvious reasons) is often conflated with GPLv3.
All I know is GPLv2 is fine, GPLv3 is usually not, and AGPL is never possible in corporations that I've worked for.
If I had to guess - The patent rights clause weirds out a lot of lawyers. Obviously anyone who works with hardware doesn't like the anti-tivoization clause. Another possibility is the AGPL (which IS lethal for obvious reasons) is often conflated with GPLv3.
All I know is GPLv2 is fine, GPLv3 is usually not, and AGPL is never possible in corporations that I've worked for.