I'd love to see more competition in the OS space. I feel that a big reason there isn't more competition is the gatekeeping of drivers by hardware vendors and the locking of bootloaders.
Why can't I install Linux on a Snapdragon laptop? Why can't I install OpenWRT on my router? Why can't I install Linux on my Pixel? It's certainly not because they are not capable - it's just that the vendors don't want you to (for one reason or another) or decide not to support a platform without giving users the ability to support it themselves.
With the liability that is an over-reliance on American core software (OS, firmware, etc) - I believe the EU should mandate unlocked bootloaders on electronic devices and force vendors to either distribute driver sources or provide enough documentation for bootleggers to write drivers.
This is simply "the right to repair" extended to the software component of hardware.