Looking at Tinder in Japan, women from Hong Kong, Shanghai, regions in China, and Singapore often talk about investment. Tinder is the den of fraudulent groups.
It's not only on Tinder, they are all over the dating apps. The funny thing is that they are also want you to talk to your friends and relatives to fall in the trap to. They are working on a Ponzi scheme here too, but once you know you fell on the trap, that process is a bit hard for them. However, I have seen story these people who were scammed also told their friends and family to invest too. Just block and kick them out when you see them on dating apps.