Fundamentally, no industry can survive on VC money forever, so there simply has to be some kind of crunch eventually, either by reducing the product, increasing the price, or both.
We as consumers are not obligated to ensure healthy profit margins for random megacorps
I mean, this is a nice sentiment in the abstract, but in actuality, we kind of are if we want the product to continue to exist. Spotify is not going to be able to operate at a loss forever, and while there is a discussion to be had about what level of profit is warranted, I don't think it's a particularly wild thing to say that the answer is at least non-negative profit.
If it isn’t economically viable, it shouldn’t exist.
What I genuinely don't understand is how you can simultaneously say that Spotify shouldn't exist if it's not economically viable, and at the same time, you'll also criticize them for any attempt to make it economically viable. If Spotify shouldn't offer the free tier because it's not viable, and you'll also attack them if they stopped offering it, what do you actually want them to do?