As I said, it wasn't updated in 10 years.

HOWEVER, it doesn't mean it wouldn't actually work. Google Play store just started doing this crap based on target API version. Due to that I often search Google for apps, check results from Play Store, and try getting an APK somewhere if I find app that looks interesting. The risk of that is obvious, just like with mod apks.

Edit: In case you trust me (which you really shouldn't as I am just a stranger), I used this APK extractor: F-Droid link Github link
And uploaded the APK here: https://d.kuku.lu/ss3xcf7fe
VirusTotal report shows the hash matches already checked Joint Pics_1.2.0_Apkpure.apk so it seems unmodified by the APK extractor (well, that's what it said before my checks anyway as it uses filename from last previous check). It also came out clean, but that's not 100% to be trusted, as usual.