The way to go, IMO, is having Android emulation on your device for backwards compatibility. SailfishOS has this, and doesn't do tracking. PureOS and Purism On

The way to go, IMO, is having Android emulation on your device for backwards compatibility. SailfishOS has this, and doesn't do tracking. PureOS and Purism One implement some FOSS techniques and rebrand them. I believe Nextcloud does this as well. Not sure why projects don't clearly mention what they're based upon, especially when its a lot like original.