It’s bizarre, because usually at some point in size, companies will start to explicitly have accessibility UAT processes. Even directorship roles specifically with that responsibility

I used to be a programmer for a large cable company (rhymes with "bombast") and at one point I was the only programmer there working on accessibility in all their mobile products. The executives there at all levels had a shocking contempt for accessibility as something to even be concerned about at all and it showed in the disastrous state of all their apps. The only reason they even began to address the problem was the threat of million-dollars-per-month fines from the FCC for all the accessibility audit failures. They even hired a blind guy as accessibility VP but he quit in despair over the corporate lack of concern after just a few months.