Google infamously pushed settings changes on their phone lines without user consent via the Google Play Services backdoor. Amazon removed the (bought) book 1984 from all Kindles. Microsoft proudly bragged about their remote app "kill switch".
Let's not even talk about about CPU vendors embedding "anti-theft" solutions which are nothing more than RCE-as-a-service on a hardware/firmware level. Or hardware vendors bundling rootkits like Lenovo on some laptop series, and most phone manufacturers on all their devices.