After many free walking tours done, with different companies, this was the first one, that you MUST pay a fix amount.
So it is not a tip based tour, so it is a normal tour with a minimum fee
Response from HK Free Walk (licensed agent)
Really thanks your review. But, I heard from the guide that she said that you need Money Machine , so she advise you where to get money. I think this is totally misunderstanding. We will not force guest to pay. Service is our priority. Anyway, hope to see you again. Enjoy your day in Hong Kong!