The PBOC surely knows that China currently has a lock on Bitcoin mining, yet they do nothing to subvert it. I would think that further centralization of mining in China would only benefit or even cement their overall control of Bitcoin in the long run.
Perhaps Bitmain and Jihan Wu are being paid/compensated to attempt to exact further control over Bitcoin and its development. Having Segwit, LN, and staying with 1MB blocks would ultimately circumvent much of that control.
This sounds like a typical fairy tale that only a reader of bitcoin reddit would believe. First off, Segwit and LN suck, but won't really have an impact on miner influence in the bitcoin space even if they are adopted.
Staying with 1MB is the reason bitcoin only occupies 45% of the total crypto market, down from 95% only six months ago. This dramatic fall in bitcoin's relevance can continue, if the small blockers want to keep working hard to surpress innovation.
And who pays the Core devs? Block stream is a $75 million front for the unproven and likely doomed sidechains business model.
And the supreme irony - Lightning is far more centralized than any other crypto...