Please don’t say people who already got ripple there cause there is no point in buying ripple if you can’t get it out, you would end up just paying fees for nothing.
While that's true, crypto investors are pretty irrational, and often they just trade to desperately cling to a profit, so it's possible that they intend to buy into Ripple temporarily and sell out when they want to withdraw. After all, I suppose most people withdraw in BTC when they finish trading.
Could this volume be fake?
Yes, but I think it's plausible that it's not.
If so could other exchanges that have the same problem (no D/W) do the same thing just to rank higher on trading volume?
Yes. They could also do it to manipulate the market, and many people speculate about the possibility of exchanges doing this.
