One of the only apps I couldn't get away from was Swiftkey on Android. I tried to like the open-source offerings for months but they were too rough around the edges. Luckily I discovered NetGuard, which is basically acts as a firewall without root (it establishes a local VPN server to route and filter traffic through). I was able to monitor and block many apps that had no gutdamn business being on the internet. The app is really really well made, the privacy policy seems like a breath of fresh air and I ended up buying the premium version even though the free one was fully functional.
I think this app (and others like it) will be increasingly useful to privacy minded individuals as the free lunch era of the internet begins to conclude.