I'd say this is a different model, targeting a different audience. The Brompton model targets more people that want to use something constantly but not bothering with property and maintenance, not temporary users like tourists and visitors. So they want the usage including permanent personal availability but avoid ownership, accountability and piling goods. The Brompton model seems relatively similar to i.e.
https://swapfiets.de/en/ - they are surprisingly popular over here, especially with the younger urban generation.
The mentioned problems with misuse etc. remain to a degree, but it is probably way less "don't be gentle it's a rental" than with ordinary rental bikes.