Of course Ethereum is not a walled garden the way AOL was. Anyone can write and deploy a smart contract, whereas adding functionality to AOL required a contract and a custom implementation. What I means instead is that much of AOL’s growth in both revenues and functionality was financed by AOL itself. AOL made a lot of investments in startups which then purchased advertising on AOL, at least in the early days of this, extended AOLs functionality.
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