I don't know that I agree with your point about data being necessary for QoS. Many of the issues I have with Discord go ignored, and I've found that more than ignorance, resources are the issue with features and reliability of open source projects.
Further I Googled around a bit to see if I could find if Discord was profitable yet, and didn't see anything suggesting it was. There were some revenue break downs, but obviously that's far from profit. I know there were lay-offs not too long ago, but I would be curious if you have evidence that their making profit.
Though it seems they've taken a number of rounds of investments [0], so if the sale of nitro and other premium services don't cover it. I would not be shocked to learn about an expansion of the "Quest" system that to be more ad like. I remember this specifically being mentioned by the CEO on the Decoder podcast.
My largest grips with Discord is how the community has adopted it as a replacement for forums, and that they have very little interest in linux support, but the former is not really their fault, and the ladder is just the reality of a lot of software. Even beyond those gripes though, I don't know that I agree it is a paragon that won't enshitify like any other for-profit software.