I didn't get to see it happen in Siem Reap, as I was living in Phnom Penh until three months ago. SR has been (understandably) devastated by the desertion though. Lots of closed down hotels, restaurants/bars, container markets etc. Would have been the worst for all of the businesses who paid rent (especially the hotels) who would have lost massive deposits/bonds and probably just had to walk away. And now it's coming into the rainy season the numbers of arrivals has dwindled again.
Obviously in PP lots of hotels, bars and restaurants closed down too, but it's not a tourist destination like SR is. The hotel where my friend liked to stay in PP sold off their furniture and closed down, after initially trying to rent out the rooms monthly for just US$300 after Covid hit. It was
a beautiful place too.