Interesting. Do you have any peer reviewed scientific publications or technical reports regarding this work?

We also compared Amazon, Google, Microsoft Azure as well as a bunch of smaller players (from Edinburgh and Cambridge) and - consistent with what you reported - we also found Google ranked worst - but that was a one-off study from 2019 (unpublished) on financial news.

Word Error Rate (WER), the standard metric for the tast, is not everything. For some applications, the ability to upload custom lexicons is paramount (ASR systems that are word-based (almost all) as opposted to phoneme based require each word to be defined ahead of being able to recognize said word).