I went to a foreign country in 2019 and got a local SIM card, I couldn't install the ISP's app (I don't remember why I needed it, to make sure I got the quota that the seller promised?) because the app was region-locked.. huh, should I change my Google account's region just for the period I'm that country?
FWIW when sth like this happens, you can try to go to a place like APKPure and actually download the damn thing without anyone telling you that you can't.
Also works for pinning versions of apps that ship some malware (like safetynet detection) with a new update. Apps installed from there are not linked to play store by default and so updates are not checked.
Similarly it’s very annoying not being able to use banking apps on a phone I bought here in Europe, even when they work fine on the phone I brought from the US