I'm quite confused here, maybe cause I'm still leaner in all these, but what is Btc grinding? I am seeing some people mentioning poker. Is btc grinding a poker game or what? But based on what the op has described here, it doesn't seem like it is that, cause he said you add a website on their platform and when you successfully add a website you will be credited with $10. So what's this exactly and how is it being done and is it being played for free or will I have to invest money before taking part in it.?
It is affiliate service. They bring players to the betting/poker sites and crypto exchanges. The benefit for the players is that they get better deal via btcgrinders as opposed going straight to the sites. For sportbooks you'd get some cash back, extra rake back for poker and discounts on fees for the crypto exchanges.