The trap design weighs the critter. Eagles and hawks in the UK are both unlikely to match the weight profile and nom on hazelnut paste.

Deployment of any device targeting wild animals like this needs approval. Processes are stringent, programs for sterilisation and release of cats took ages to get approved. Rewilding is held up for years on assessment.

This is the least likely problem with this approach. Much more likely is that it isn't sufficiently effective and surprising things happen when the grey squirrel population is suppressed, which are counter productive.

I hope it works.