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Definitely not humanity’s biggest problem. Chromium becoming the de facto browser creates a situation where one entity controls standards and influences how the web operates, impacting user choice and freedom, and reduces incentives for privacy and security updates.
This already happened once with IE.
I only use Firefox on desktop, but I doubt it will be a relevant choice much longer.
Edit: wrt telemetry, I was referring to the Android operating system. They collect anything and everything on users and all nearby devices.
Here is a real world example of someone doing some reverse engineering of compiled code. Might help you understand what is possible, and some of the processes. https://nee.lv/2021/02/28/How-I-cut-GTA-Online-loading-times-by-70/