Another factor in crypto is that especially with proof-of-stake coins (like ETH is heading toward), part of the security of the protocol is in the expense of doing a hostile takeover of the network. A paltry $8.8 million valuation would presume that someone with as little as that could buy up all the supply (or 51%) of ETH and take effective control of the network.
You're right that attempting to do so would drive up the price, very rapidly.
Another sweeping point the author makes without backing up is the idea of "infinite competition" in the crypto space. Yes, anyone can fork BTC or ETH and make their own coin, but miners, stakers, exchanges, users, app developers, etc, won't necessarily flock to it. "Trust" is not built into the protocol.
I have no faith that someone who clicks the "Fork" button on Github necessarily has any idea how to run, maintain, secure, and grow a blockchain into doing something unique or novel. And I wouldn't stake my business or assets on it, per se, unless I was convinced that a team of people and a community was able to spring up around that blockchain.
Network effects matter, especially in crypto-assets. I trust the BTC network, because it's gone 9 years without a major exploit. I trust it because of the community, network, and ecosystem behind it. To act as if a fly-by-night crypto can swoop in and steal that crown so easily is foolish. Anyone can make a Linux fork, doesn't mean you're going to dominate the desktop market.