I don't like X, and it is growing = cancer, is the full depth of the analogy. Pretty weak. Unlike cancer, we wouldn't want to eliminate 100% of expenses. Unlike cancer, expenses are necessary for survival. Unlike cancer, it's possible expenses should be growing faster, to fuel growth or whatever - this is the argument that needs to be made. Calling something cancer this loosely, is very close to the annoyance of invoking Hitler so quickly.

"I don't know about all dem der hosting costs you speak of, but I sure as hell don't like that cancer"

I guess there are different ways to read it. You could say the same of anything you don't like that grows at a superlinear rate. Given our tendency to not like things, and the tendency of things to grow at a superlinear rate, the analogy is non-specific, and hardly neat.

For me, it echoes the tendency of every angry child on the internet to call things they don't like "cancer." Edginess of this kind does not speak to me.