Spotify is one datapoint, and I hate to be cynical, but was probably paid off (in free / drastically reduced priced cloud services ala Netflix on AWS) by Google to write all of that.
Even if not, they are such a large well known name that they probably got special treatment. The real proof in the pudding is the support that the 99% get, not the special case 1%.
At the end of the article, Quizlet noted their experience with GCP support:
"Overall it was a smooth transition and we're very glad that we picked GCP as our provider - we've received excellent support and scaled up our deployment with few incidents."
Could you quote the line you're referencing? The key differentiator in that article sounds like data services (dataproc et al) and I don't see anything mentioning support.
Even if not, they are such a large well known name that they probably got special treatment. The real proof in the pudding is the support that the 99% get, not the special case 1%.