As I understand it, "Matt" could be prosecuted for breaching the data protection act.
There is no evidence of a "pop up" brothel ... just a few neighbours complaining of the number of visitors, hassling the owner and spoiling the stay of the guests at the ABnB.
Correct, your video doorbell is not supposed to be able to monitor someone else's doorway, without express permission see
External Link/Members OnlyAlthough it does scream of brothel. 3 women living there, 15 male visitors not staying long in a 24 hour period.