>>they are a shared, permissionless and open source protocol that is resistant to takeover by a single entity

And to prevent that takeover by a single entity (AKA 51% attack) it uses a very expensive (as in processing power) mechanism - proof-of-work to delegate the right of adding new transactions to the chain. And that makes is unscalable because as the network grows, you need more processing power. It flies in the face of economies of scale. It's a feature not a bug but that also makes it unsuitable for any business use cases.

Like any other market, consolidation will eventually lead to 2-3 whales will end up controlling majority of the nodes and can control an entire chain. In fact some of the new age blockchain startups are straight up centralized. What they are peddling is anything but a shared, permission-less and trust-less blockchain.