As an Android developer myself, this article has especially been imperative to my work so I just clicked the source and, from my understanding, this GBATemp article sounds a bit misleading.
Here's directly from the Google source:
To be clear, developers will have the same freedom to distribute their apps directly to users through sideloading or to use any app store they prefer.
Meaning, no. Google is NOT getting rid of Side loading or "stray APKs". They're simply requiring
developers to give personal information to have the application signed for running them on consumers' Android devices.
Assuming Google's "fairly consistent" practices are still going to be the same, all this means is that if an application (APK) is digitally unsigned, it won't install on your android device.
We already have issues with Android applications stating they "aren't compatible with your device" even though they actually in fact are but contain a software information discrepancy stopping the application from running on the device (and, in turn, bringing up that error when a consumer attempts installing it) and other reasons why an application won't install but this will just be yet another clause a consumer will face when attempting to install said application I assume.
Side loading, third-party stores/app distributors and, possibly, "Degoogling" will still be possible. Any APKs from the listed dates just require the developer to have their information "traceable" by Google by having it being digitally signed for it to actually work on any Android device and has absolutely nothing to do with the Google Play Store.
It still sucks, yes, but it DOES NOT effect the consumer, nor their ability to run stray APKs without the Google Play Store. If the application is not "Verified by Google", it'll possibly tell you so. If it IS verified by Google (Developer-side), but still not from the Google Play Store and is a "stray APK", it WILL WORK STILL EVEN AFTER 2027+.
Whether this means all Android applications requiring the internet to "Verify it has been properly screened by Google" or not nor whether we have "Active "verification period" licenses" such as that in which Apple has isn't known to me as of now.
EDIT:
I'd like to state that the GBTAtemp article SOUNDS misleading, not that it is. Due to the way it is written, it makes me feel it creates fear and, of course, discussion especially by singling out "which could notably impact how a lot of gamers use their phones as emulation devices." and have the "Google Play" logo as the cover image.
In reality, it affects all developers and, from my understanding, is "so-called" designed to stop malware and scam. As of now, many emulators exist on the Google Play Store so clearly emulation isn't the issue, nor is being attacked as why this is the decision Google has made. Will Google be able to "de-verify" apps they deem is malicious (Including emulators)? Probably so but if they haven't deemed emulation on their Google Play Store "malicious" then they likely aren't deciding to deem a stray APK of said application "malicious" either, as the rules for creating content and posting to Google Play will certainly be different than that of being verified. I just wanted to clear that up.
Google isn't the one "distributing" these APKs, verified or not, so I don't know if Nintendo, for example, are even able to complain to Google about emulator APKs (That have been verified) instead of the emulator distributor, sending DMCAs to private entities such as the users. As per my understanding, this is just another layer of security, like Microsoft SmartScreen, and isn't able to be targeted by companies like Nintendo for not blocking an emulator for being "Malware" or "Illegal."
Basically, no. This is the Android Developer central. Unless stated otherwise, (Which hasn't been) the worries of many of the users here is that Google Play Store requirements are the leading factors to whether an application will be verified by Google or not and, thus far, that has NOT been stated nor hinted upon either. This has nothing to do with Google Play nor being allowed to install emulators on your device as far as the information we've been given thus far states.