If you want to gradually move away from closed and/or paid software, afaik, the only way is through unlocking the bootloader and uninstalling programs through there.
Alternatively, there is the nuclear option, to replace the whole system, and start from zero with a distro as close as possible from AOSP. Worth noting it also requires unlocking the bootloader.
Doesn’t appear to have a RSS feed either, and doesn’t seem like Nitter supports it. 😔