Being part of a medium-size company I realise the reason to not have QA is to save money. When an outage occurs because "oops, we didn't catch that bug", the issue is fixed within minutes. I suspect this is fine for the company and I imagine that the cost of these outages is cheaper than the cost of dedicated QA teams. Besides, this "culture" of "developers should own their products from conception to deployment, including QA" is becoming more ingrained in all new companies. It almost seems as if developers should be in charge of almost everything... and certainly it does cut costs (at least in Europe where we don't have such salaries as in the USA):

developers should know about frontend, backend, databases, now the cloud, devops, developers should have a "product mind", they know monitoring, they should do paid on-call rotations, they should do QA, they should help in technical interviews, they should mentor juniors colleagues, they should do "dojos" and "katas", they are encourage to go to conferences and "share knowledge" when they come back, they should help onboarding of new colleagues, they should organize "tech talks", they should... and all with the excuse "we care about you growing as a professional".