DJI used to have the "Mimo" app in the play store. It was rated very low, 2.3 stars. The app required users to allow the permission to read the phone's IMEI. If you denied that permission, the app closed. Myself, and I'm sure plenty of others, have reported this to the play store as something against the play store policies. Perhaps Google gave in to the complaints eventually and told DJI, enough is enough with your crap, who knows... And that made DJI say, "enough is enough with _you_, we're big enough to distribute these outside the play store and keep our invasive tracking and permissions".

Page visible only if you have installed the app in the past: https://play.google.com/store/apps/details?id=dji.mimo