I always try to tip the maid when I stay at a hotel. Not a huge tip but a few bucks to let them know I appreciate what they do.
Tipping was common place when I worked in Alaska at some of the big resorts but towards the end of the 90’s the companies started to take away the cards asking to tip maids, baristas and such, . Only bar tenders were allowed to ask for tips.
I think also back when maids actually spoke English there was actually more interaction between maids and guests, so it was more intuitive that they should be tipped.
It’s different now when you don’t actually interact with them, unless you request something like extra towels from them.