Nope, not just PCs, just electronics in general.

The pandemic allowed tens of millions of well-off western office workers to move out of tiny urban flats into more spacious housing. While having to spend a lot of time in their new homes, which was previously in ”public” places (eg restaurants, bars, what have you)

Now, what to do with all that space? A giant tv, washer and dryer, a nice stereo set, new induction stove, the list goes on and on…

PC demand also increased obviously, but probably bitcoin miners caused the most demand for PC hardware components