Google’s graveyard is quite big. At this point am reluctant to use any of their services in fear of it disappearing.
When I switched to android I was looking for Play Music to buy some new songs and it had shut down shortly after I purchased my pixel. Real disappointing since I prefer to just buy a song here and there instead of subscribing to a streaming platform.
Some artists provide a digital download on their websites but it’s uncommon. If there’s a viable alternative to Play Music I’d love to hear about it!
For buying music, besides the big names like Amazon/iTunes, you might consider:
7digital UK or 7digital US, if in neither country, I think it should try to point you to the relevant storefront for yours if they have one.
Qobuz, which appears to be available in more countries.
Bandcamp for indies and experimental music.
The first two have a good mix of major labels and indies, so are probably your best bet after Amazon/iTunes, meanwhile Bandcamp is great for more niche and potentially upcoming artists. So far as I can tell there isn’t really just one storefront to go with for buying music unless you’re okay with the aforementioned big names.