In comparison, selling the information itself could potentially be a much more sustainable business model. In this particular case, they are reportedly charging around €400 for information on only 6 matches, so they could potentially make significant money from selling the information without having to place large bets themselves.
And there you go, on the 3rd post and after 40 replies, you finally mentioned where the problem is!
400 for information on some low-level matches that will be flagged instantly by any gambling site where nowadays even the slightest deviations from your normal betting is tracked and analyzed?
You really think that even if the tip is legit, the bookie is going to say, oh, nothing unusual for this guy from Thailand to suddenly, out of the blue, bet on a table tennis match in Krakow and win $10k. And again, nothing suspicious that we only have 10 bets, everyone has won, and nobody is even from Europe, of course; everything is normal, let's pay them!