App developer here. Our company went through this exact thing, to a T.
After a lot of back & forth with Support we implemented another feature which requires full file system access and they suddenly accepted it. Such a bullshit way to do it, but hey, it worked.
They bullied Syncthing the same way. Fortunately, Syncthing-fork is still developed and available on F-droid.
I understand a well-curated app store (which Play Store is not) placing some limits on apps getting all files access. In a modern security model, that's not a permission most apps should have, however synchronization and file management apps obviously should have it.
Was going to comment the same, this issue has existed for some time for other apps. LibreTorrent ran into the same issue and now the F-Droid version is their full-featured app while the Google Play version is restricted due to Google.
Interesting that Nextcloud managed to last this long on Google Play without running into the same limitations (until now that is).
This works very well for tech enthusiasts and people who self-host nextcloud at home.
The issue is when you are a government or university, it becomes harder to get all your users (which are probably not all tech savvy) to install a third party app store deal with the Android warnings about installing from third-parties, etc etc.
And this is probably the user base Google are targeting with this move (assuming it's malicious) . When the higher ups complain that their files are not syncing and need to install things with a special procedure they sometimes wonder why they are not using M365 or Google which seems hassle free.
Not to mention the "see this big alert saying this isn't safe? Well for this one time it /is/ safe so do so" While curbing the mentality of "oh it was safe last time so it must be safe this time"
It's not as simple as telling people to use F-Droid. People with non-rooted phones won't get automatic updates via F-Droid which is a big hurdle. Unless I'm misremembering? I wouldn't know because I run rooted CalyxOS now. Last time I used F-Droid on a plain Android phone is a while ago for me.
My phone is not getting CalyxOS updates anymore. Gotta wipe it all and move to lineageos now. Man I hate mobile operating systems. I need good linux phones right now. Android can go to hell.
People with non-rooted phones won’t get automatic updates via F-Droid which is a big hurdle.
Not true if the app to update targets a high enough API version (I think API 34 or 35) and if you use F-Droid Basic.
NOTE: The Basic version of F-Droid Client has a reduced feature set (e.g. no nearby share and no panic feature). It targets Android 13 and can do unattended updates without privileged extension or root.
When I saw the process to add Google drive support to an app I thought: "wouldn't be easier to just discontinue the public APIs?"
If I was a dev I would immediately remove the integration instead of paying the required thousands (yearly!) to keep it. Then in the app explain the situation to the customer, add a referral link to Dropbox, onedrive or other competitors
I use FolderSync. Works well and I prefer one app synchronizing files than 6. I still use the Nextcloud app for files I don’t sync that I need access to, but overall it’s really bad. The camera upload erased a ton of my pictures on a vacation. I deleted the synced pictures on my phone storage and the Nextcloud app overwrote the images as the new photos had the same file name.