You might sideload an Android app, or manually install its APK package, if you're using a custom version of Android that doesn't include Google's Play Store. Alternately, the app might be experimental, under development, or perhaps no longer maintained and offered by its developer. Until now, the existence of sideload-ready APKs on the web was something that seemed to be tolerated, if warned against, by Google.
This quiet standstill is being shaken up by a new feature in Google's Play Integrity API. As reported by Android Authority, developer tools to push "remediation" dialogs during sideloading debuted at Google's I/O conference in May, have begun showing up on users' phones. Sideloaders of apps from the British shop Tesco, fandom app BeyBlade X, and ChatGPT have reported "Get this app from Play" prompts, which cannot be worked around. An Android gaming handheld user encountered a similarly worded prompt from Diablo Immortal on their device three months ago.
Google's Play Integrity API is how apps have previously blocked access when loaded onto phones that are in some way modified from a stock OS with all Google Play integrations intact. Recently, a popular two-factor authentication app blocked access on rooted phones, including the security-minded GrapheneOS. Apps can call the Play Integrity API and get back an "integrity verdict," relaying if the phone has a "trustworthy" software environment, has Google Play Protect enabled, and passes other software checks.
Graphene has questioned the veracity of Google's Integrity API and SafetyNet Attestation systems, recommending instead standard Android hardware attestation. Rahman notes that apps do not have to take an all-or-nothing approach to integrity checking. Rather than block installation entirely, apps could call on the API only during sensitive actions, issuing a warning there. But not having a Play Store connection can also deprive developers of metrics, allow for installation on incompatible devices (and resulting bad reviews), and, of course, open the door to paid app piracy.
Just the term "side loading" instantly frames installing software on a device you own as something shady.
I've had people clueless about tech tell me that:
using Linux and not buying Windows I rob MS's developers,
not doing things the way big corporations want I deprive them of profits and thus rob their workers,
using your own device the way you want it is a crime if you have to bypass what the vendor does,
GPL and BSD licenses are not real sovereign citizen stuff, and if I'm not paying someone for software, I'm robbing the working class,
repairing things yourself in your house is robbing people working in those trades,
reading things in the Web is robbing university professors and book store workers and publishers,
having to learn a particular technology while doing my task at work means I'm a fraud and rob my employer or our clients, because apparently I have to keep all the today's tech in my head before needing any of it,
if I don't know some single thing another person knows, they are obviously better qualified than me (say, that other person can write Windows device drivers, while the job is about systems integration),
...
and I don't remember more stupid shit from those people and I don't want to, but generally being not a dumb ape in today's world is considered suspicious apparently.
After that wonderful experience I might be silent about my views with people usually, but really I'll never stop being anarchist (whatever kind of anarchism that is).
I bet they'll say staying healthy without getting sick equals robbing from hospitals and pharmaceutical companies.
Their views were in general along the lines that there are poor people and there are rich people. Poor people owe nobody nothing (including respect to property rights, personal space, privacy and so on), and are owed everything. Rich people vice versa, it's them paying with rights for their asocial riches.
Now who's poor is not absolute, it's who owns less than deserved, and what's deserved is big for their friends and similar-minded people. And who's rich is the same, but owning more than deserved, and if they don't like you, you deserve less.
It's the kind of people who love Stalin.