Which line specifically says they will keep AGI out of the hands of “big tech companies”.

“Big tech companies” was in quotation marks because it’s a journalistic term, not a direct quotation from their charter.

But the intention was precisely that - just read the charter. Or if you want it directly from the founders, read this interview and count how many times they refer to Google https://medium.com/backchannel/how-elon-musk-and-y-combinato...

Look at the date of that article, those ideas look good on paper but then reality kicks in and you have to spend lot of money on computing, who funds that, its the "Big tech companies".

I bet you could chatGPT to actually explain this to you, it's really not very hard

'unduly concentrate power'