Asked some friends, one thought would be to count the number of people, by estimating movement, more movement = more people.
It wouldn't then block the user, but it would trigger an investigation at that address - if the device is being used to watch sports in a pub / bar, they want the large revenue from the owner, not the 40 euros per month subscription.
In the UK, some pubs pay upwards of £10,000 per month to licence the sports programmes, it's a rip off. And one supplier, was still asking for the fee to be paid during Covid lockdown.