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"bubble": stocks have been said to be in "bubbles". If a person claims "M-Pesa is [in] a bubble" he would be talking about the market cap of the company, in the same way that "Bitcoin is [in] a bubble" speaks to the market cap of Bitcoin on some exchanges. Quite meaningful, actually.

"environment": Proof of work systems ensure that the ledger is secure and worthy of trust. Proof of Authority systems require trust, where the ledger is secure "because we say so." Isn't this the major reason why people are fleeing from legal tender? People can't trust the issuers, the processors, or the banks because they're colluding with politicians who provide bailouts using taxpayer dollars?

"ICO scam": absolutely makes sense in a centralized system. Are you actually claiming that people don't create scam companies with centralized currencies? Because why? Even legitimate companies can be slandered for the same reasons that people call ICOs "scams". The Franklin Mint, for example, produces coins which are sold on late-night infomercials that have little-to-no intrinsic value, but people buy for speculative reasons. Are they a scam? The reasoning is identical.

"slow/expensive transactions": One of Bitcoins main value propositions is aiding in international transfers. The centralized systems were too slow and expensive, so a better alternative was developed. Saying that speed and expense aren't complaints that people have made about existing centralized systems is simply wrong.

And so on and so forth.