If Purism had to do some modifications to get Debian to work on their phone thats not a problem, the problem would be if they make it impossible for others to d

If Purism had to do some modifications to get Debian to work on their phone thats not a problem, the problem would be if they make it impossible for others to do the same with another Linux etc ie making it impossible or placing roadblocks to install other oses on their devices.