"Three different people with direct knowledge of the conversations confirmed to AP that F1 asked General Motors if it would partner with someone other than Andretti."
"Three different people with direct knowledge of the conversations confirmed to AP that F1 asked General Motors if it would partner with someone other than Andretti."

apnews.com
Column: F1 bosses say Andretti snub isn't personal even though it feels like and looks like a grudge

They saw the potential and realized they want other people to win also
I would love if they wiped the floor. Seems like F1 wanted USA involved due to US money but they did not want them too involved, like please watch don't touch
Unfortunately this is highly unlikely even if they join because the skills required for F1 are very specialised even in the context of motor racing. They will need at least a few years to adapt and hire people with the relevant knowledge.