On android I degoogled almost everything by using Fossify apps. Only gmail and maps remain for obvious reasons. My photos are now synced with Syncthing through my wireguard vpn. Calendar/Notes have local backups that are also synced. The simple camera I use (fossify too) works with physical directories instead of meta directories that I hate.
I don't get this. My current air purifier (philips) costs like 150€, includes an air quality sensor and the app reports shows graphs with PPM, VOC, whatever.
Why would I pay double for a device that doesn't even filter the air of my room?
Spanish congress approved recently a way to stop such a thing.