"including Thawte, VeriSign, Equifax, GeoTrust, and RapidSSL" RIP RapidSSL wildcard
Wow, I never realised VeriSign was a Symantec brand. I'm not sure what it says that Google doesn't trust the company that operates the registry for .com
Don't read too much into Alphabet/Google using other gTLDs instead of .com, like https://abc.xyz or https://blog.google -- that's separate work done by separate people on a separate team.