No, it’s the same on the Windows side. Personally I like to build a new one in parallel, then migrate. I do plenty of upgrades on desktops, but I don’t think I’ve ever done one on a server (except stuff like CentOS 7 to 8 where it’s not really that significant of a change).
Migration is the safe option, but if it’s a huge pain to migrate, I might do the in-place upgrade with a rollback plan ready if it really goes poorly.
I’m not sure what this guy is smoking, but I don’t want any. He talks about licenses being different from contracts, but there isn’t any significant difference. He talks about developers getting paid instead of releasing their work for free, but there’s nothing stopping anyone from doing this right now. Plenty of products offer business licenses separate from their copyleft licenses. Anyone who releases their software under GPL or whatever chooses to do that, because that’s what they want to do. If they wanted to make it only source-available, or to sell source access, they would have.
Probably, but exactly what you do would depend on your exact model. I would get the technical service manual for your vehicle, find the part about replacing that module, and follow the directions to remove it.
Can you record the sound? I’ve never heard of a power supply having any kind of noisemaker. It’s probably just electrical interference or coil whine or something, where the waveform happens to produce that periodic sound. (You might even look around and find a nearby device changing its power draw with the same periodicity.)