Everyone wants to fully control the devices they own. But more importantly they want their devices to work. So a half working open source lineageOS mobile is less valuable to them (and me), than a closed source, but working blob.

But if you can get them to understand, that open source eventually means consumer friendly, that the device will be fully under their control(no ads, no restrictions) and working if OSS gets more support, they will listen. But since they largely do not know all this, I think it is exactly because most free software preaching evolves only around devs.