Bear in mind, It isn’t just the UK that has radio hams with licenses - Most countries have them!
I look at it as a good thing that we do not come under the brief of a radio ham license.
If we did, then it would be the end of Lorawan.
Apart from the Gentleman’s agreement about bandplans and ERP power, there are strict restrictions on encryption and broadcasting (as you have pointed out) - basically, its not allowed and if you break the rules as they are set at the momment, you lose your radio ham license
It continues to be an unknown - in some way, we are best to leave ofcom out of it. We are not infringing any of their current rules as far as I know!
We are harming no-one anyway and I don’t see any law that actively prohibits us from doing this and no-one has so far been prosecuted. The worst that could happen is that we are told to stop operating the equipment!
The biggest worry is if recent law privacy changes are seen to apply to Lorawan (which is outside the radio ham license anyway), and this is deemed sufficient for a criminal prosecution outside of Ofcom - but I think it is rather far fetched worry atm