Sam Diamond, from classified ads site Gumtree, says there are more than 20,000 bikes on the site at the moment - and the vast majority are from genuine buyers and sellers.
More top news
Save Your Uber in London was set up after it was announced the firm would not have its licence renewed when it expires next week.
Survivors are still traumatised, homeless and want answers.
The number of overseas visitors to the UK topped four million in July for the first time, official figures show.