Gmail’s API lockdown will kill some third-party app access, starting July 15
I see this as a double-edged sword.1. It makes sense that Google wants to stop apps from abusing their storage platform. There are a lot of projects that abuse the data storage capacity. There was that one app that converted files to Base64 or something and was storing files that way as email text. Obviously not cool. However, Google needs to be explicitly clear on expectations and throw some people-power behind the reviews, since many are being denied by (seemingly) some automated process.2. The second issue I see is that it will encourage less secure methods of using these apps.
SMSBackup+ in particular is discussing the possibility of moving to "App Passwords" to bypass 2FA and provide the app access it needs to upload and store the data.
Issue being, App Passwords are incredibly fragile, they provide near-unfettered access to IMAP and other account features with no auditing.
Caveat emptor and all that.I think SMSBackup+, specifically, has a bit of a gray line as SMS messages can technically be sent via email and vice versa, (among other similarities). It's a shame that Google is becoming so draconian about their data storage uses.