For a start, stop buying those products: vote with your wallet.
Do you own a phone that's easily rooted? Who else does?
What about your WiFi routers? Internet modem? AirTags? Smart home appliances?
Rooting a phone fails certain security checks that prevent a lot of banking apps from working on your device.
In the early 2010s the majority of Androids were easily rootable and the ROM-modding community flourished as a result.