Arbitrum (ARB) gained 45% last week after Robinhood (HOOD) launched its own blockchain using Arbitrum's technology. Under Arbitrum's expansion program, chains built on their tech have to pay 10% of their net profits back to Arbitrum. 8% goes to their DAO and 2% goes to developers. Robinhood's chain is already generating significant fees, taking in $4.3 million in revenue on Sept. 3 alone. This gives Arbitrum a new revenue stream at a good time, since their own network fees dropped to $365k in August compared to $1.6 million a year ago. ARB token holders don't get dividends or buybacks, just voting rights, but the capital injection from Robinhood's activity could help fund future development.