Chinese mining pools still control at least 70% of the Bitcoin hashrate.  They still have the biggest Bitcoin pools over the last couple of years, so we can say that they are in control. However, I don't think that they are stupid enough to destroy Bitcoin. Even though there are reports that they government is cracking down or have thoughts of shutting down Bitcoin mining farms because it is hazardous to their environment. I doubt that they destroying it has cross their mind, so this is just probably a hearsay.