Nothing new - lots of ladies on various websites offer this - I have had some off Thaifriendly and WeChat but only in Thailand! Can’t imagine this will be too different!
Lots of upside to doing it but one downside is that if you are in an area where there are many options, it is possible to feel that you are loosing out as you still have her for another two days (or whatever) and can’t pursue the other options! So think it through carefully before committing to it!