A mix really.
I think it just mirrors the increasing disrespect in wider society in the UK. Convenience stores having to employ security guards, staff in pubs, retail, paramedics wearing bodycams, riots spread through TikTok, etc. The rail network isn't anything special in this regard.
I do also think it needs to be born in mind that social media and everything being videoed makes crime more visible. Our village Facebook group today had a post up about somebody littering from their car window. This isn't new, it happened decades ago in the village, but there wasn't a Facebook group in the 1990s and someone would just begrudgingly clean it up and at best gossip about it at the pub, but certainly not broadcast it to a thousand or so people.
These "auditors" and grade A weapons though. People need to follow the NPSA guidance on dealing with them.
https://www.npsa.gov.uk/social-media-auditors.
The TLDR is you should acknowledge their presence and allude to discovering their presence due to your CCTV/security, be polite, don't try and stop them filming or get into protracted discussions with them, then walk away. Appreciate you can't so easily do this when you're a ticket inspector trying to get them to buy a new ticket, but if they're just hanging around filming random stuff, leave them to it - they won't get any confrontation, which is the content they want, so they'll eventually leave and not bother to upload the footage because nobody
genuinely wants to see half an hour of standing outside the gates to a train depot with nothing happening. Even the geekiest of train geeks wouldn't watch that, and the "auditors" know it. They also know that if they upload videos to their social media channels which don't generate engagement, they'll be demoted in the algorithms which dictate who gets to see their content, and in turn, how much money they make from it all.