I think you might be living in a bubble, if this is the "most evil" thing you have heard of a big tech company doing. Go read up on IBM's history, especially in the 30s and 40s. Or a more contemporary example, read up on Embrace, Extend, Extinguish. Or Amazon's mistreatment of workers in both corporate and warehouse settings. Or Meta scraping data off your devices without permission to train AI.
And, though I know some folks here disagree, plenty of people around the world believe what's happening in Gaza is a genocide, and Big Tech has materially contributed to making it happen. Or, if you want another example of human cost, talk about how resources for electronics are mined, or how electronics are manufactured.
Saying, "the most evil thing big tech has ever done is make some chat bubbles blue" puts a whole lot of human lives below the color of some chat bubbles.
You can think Apple did a really bad thing by doing that, that's fine. No complaints. But to call it the most evil thing ever done erases an incalculable amount of human suffering.