The blue collar labor market is just a magnificent joke. I tried it for about 7 years of my life and they will literally only employ you if they somehow know you or you know someone else. If you're just a stranger, they won't even look at your resume. They don't even want to train on shit that in the 1960-1990's, they would take you if you weren't a total moron and could pass a drug test (if that even).
Modern HR has become a joke in this situation as well. Not only do they pretend like they add value to a company, but they filter out people who could easily be exploited for cheap simply because they don't have experience. Seriously, just hire a rando who seems vetted, make them do some bitch work and occasionally the main job duties. If they catch on, give them more, if not, get rid of them. It's like employers have become more risk averse than someone investing in CD's...
Bearing in mind it's only really the last generation or so in the UK who have gotten used to not expecting things like double pay for a night shift, workers expecting to be paid about £10p/h for a bar shift finishing at 4am still isn't a bad deal at all
My hypothesis is that a bunch of people in low-paid service jobs like this had their jobs cut under them by the pandemic and were forced to find alternative income streams. That was painful at the time, but now many of those people find themselves in a much stronger position to refuse the work.