The phone snatchers at least in the UK prefer souped up e-bikes rather than e-motorcycles. That thing the police would stop you if you didn't have a number plate.

Also cycling on the pavement where the snatching occurs is more acceptable on an e-bike, even though it's illegal even for a pedal bike.

The police should still be stopping those bikes as they don't meet the legal definition of EAPC and so require a licence plate. Not that they do.

The have been stopping them and crushing the bikes although it's patchy https://www.bbc.co.uk/news/articles/c89yw3wzl9no