At a basic level I appreciate this sentiment. However, the common dysfunction I see in large corporation is its not the lack of people who give a shit. Its lacking a sufficient number of people in positions of power that give a shit -- such that they can actually make change happen.
All too often competing pressures (features, profit, delivery speed, politics) take precedence; not leaving time for things that would really move the needle. In essence, too many leaders are happy to ship garbage; they don't care (or don't know).
If Github were to put out a statement saying "service quality is our priority", it is fairly meaningless. If they added "here's how we'll get there", maybe it helps some. Moreso -- "from now on executive compensation is tied to these SLOs", then maybe something would actually happen.