UK Site-Stripping Artefact Grabfests "Ethical"?

This from a former PAS FLO: Anni Byard - really old metal things @ArchaeoAnni 9 g
[...] the detectival lads have always been very pro PAS in my experience, they have their own recording crew... And make available to PAS and ensure folks report treasure. In fact they're the rally group whose ethos I would like to see replicated. They've worked with PAS for several years.Are commercial pay-to-dig artefact hunting rallies in any way "ethical" archaeologically or otherwise? Asking for a friend.