Many many AWS people have left citing on call as the worst part of their job. Also, it is really a far fetched allegation that interviewers try to fail interviewees to hide their own incompetence. I get that you may not think much of Google SREs but to allege that is just in bad spirit. I hope you do get to see that the people inside Google are one of the best perks of working here. They are smart and motivated and willing to help each other.