That is not necesarily the problem. Because Application Specific Integrated Circuits are used, normal computing resources cannot be used to effectively hash and manipulating the system, keeping super computers and maybe even quantum computers at bay.

If mining is done using cpu's, a single supercomputer could take control over the entire hashrate and thus coin distribution in an instant. If you look at hashpower, you can see a weird pattern where the line goes up but hits the same boundary as the total amount of combuting power by supercomputers. Something really strange. Eventually it goes above it, surpassing the combined powers of the top500 supercomputers. But it almost seems like the short cap at hashrate power was caused by supercomputers that hashed away at the blockchain.