The 1000' IMC and 500' AAL are ICAO recommended figures. The Blue Book.
Airlines follow these recommendations in the same way that they take a certain amount of fuel as reserves or avoid obstacles by a certain minimum amount. These airlines are following 'best practice' as detailed in the ICAO document.
Those airlines that choose not to follow these recommendations are simply choosing to ignore what has become the industry standard procedures to improve flight safety.
The use of the OFDM/FLIDRAS data to initiate contact, through Base Facilitator, with an individual is also 'best practice' and is used in the event that a pilot has exceeded a Class 2 limitation or regularly exceeds the same limitation. To allow the pilot to continue flying in the same manner after this knowledge has been unearthed would be foolish in the extreme.
It will only be a matter of time before the pilot exceeds the limitation to such an extent that recovery will be a matter of chance or damage or destruction will occur.
If a pilot has been warned, perhaps more than once, that his flying is outside the accepted norms and then chooses to ignore that advice and once again triggers the FLIDRAS/OFDM then his actions will finally be made known to the airline management.
If this sequence of events takes place then it is almost certain that he deserves no more than his P45 and a view of the door.
I am certain that this is the procedure followed here by easyJet.