First off you don't understand math or how stocks or crypto works because a market cap of a "security" doesn't actually need that exact amount to actually flow into the coin to make it worth that, the free market just needs to feel it is worth that. You think $60 million actual dollars flowed into Doge to get it to where it was at its peak for instance? Hell no.

Second, no income is going to be "stolen" because this is supplemental to the game, LoL makes their money off microtransactions of extra game content, this is a tipping bot which is a completely separate revenue opportunity that doesn't effect LoL's bottom line unless they decide to build their own tipping bot.