At the end it says,
"Thank you for your cooperation". (screenshot in
message #7) To me this sounds like they expect people to cooperate with the implication they will keep monitoring the same users and potentially something else might happen if the user doesn't cooperate.
When this subject was discussed after Elon talked about it, there was a lot of speculation on how they might decide if somebody is abusing the system. It looks like the definition is not as sophisticated as some expected. In other words, it doesn't take into account your home location, whether you have a home charger or what percentage of charging happens at home. From what I have read, they only look at how many times you have supercharged at each station. If this number is more than X times during last Y months, then you get an email.
This creates a disadvantage to heavy users who have a home charger but travel long distance on a specific route frequently. The user might use superchargers only for 5% of driving but that 5% would be a lot if the user drives a lot and most long distance travel is on same route. I think they should look at what percentage of charging happens at home.
If they count number of times somebody has supercharged at each station, that would fail to identify Uber drivers or commercial drivers who supercharge a lot at different stations. Of course I might have misunderstood it. More data would be useful from people who received the email.