I remember once, a long time ago, a colleague asked me to publish some content on our website.
It was marketing material, for a conference. PDF, of course. With no consideration to #accessibility whatsoever.
I declined, and we had a meeting. I explained why I couldn't publish the material in its current state and they said "But there won't be any blind people at this conference!"
To which I replied, "No, there won't, because your marketing means they can't possibly even know it is on."