The M2 isn't really intended as an upgrade path for M1 owners. The new chip is better, but not so much that it will make a difference to your life. Anyone who did this (presumably because they were crushing the M1) would be disappointed because the M2 wouldn't be much better. Someone in that situation would have to shop for an M1Pro/Max/Ultra to see a tangible benefit.
Given the same (aging) hardware and only an incremental performance boost, I doubt many would even think to do this. A few MacBook Air folks have done this and posted about it, and there are a gazillion YouTube videos on exactly this. e.g.