It’s just not something you can do in your garage these days (or for the past few decades), even if the designs were open sourced. I like your idea and wish there was less concentrated power in chip manufacturing, I just don’t think it’s very feasible.

I feel like there’s very few people who could design and build their own brain implant chip. Even in the far future

It’s a different method of installing software. You can install an app of your choice via another device rather than download only certified software from an app store… Different words for different methods… Also sideloading has been around as a term for a long as smartphones have existed

But can’t they just look in their call logs already? My phone tells me all the info you quoted Google as giving.

Doesn’t everyone get that on their phone already?