I was talking to a guy at work about this just last week. Pre-pandemic he worked as a part time bouncer at nightclubs in Edinburgh. He got furloughed from his day job as a cleaner. Anyway, he ended up working security at the hotel for a good while.
The issues he said were people going off their nut with boredom, only allowed out for an escorted 15 minutes a day to an enclosed space for fresh air (alone). The conditions are alright, he told me, but it is like being in prison.
There were loads of people trying to avoid going into the hotel in the first place - he told me a story of four Chinese guys who came into the airport, managed to give security the slip and hopped in a taxi. The taxi was stopped exiting the airport by the police. He had loads of other stories too.