> In real-world trials conducted on the streets of London in February, in cooperation with Deliveroo couriers, the bell proved so effective that couriers expressed a desire to keep it.

Of course they would, because a lot of them either don’t have any bell, or have a shitty ping-ping bell that doesn’t produce good sound.

Or could sell it on eBay for an amount of money that's nontrivial from POV of a gig economy worker.