Guarantee that A) it doesn't taste just like real butter, and B) it'll make you shit yourself and bring a return of the label "may cause anal leakage".

Does that mean it's not a potentially viable product? No, it doesn't. But let's not bullshit.

why do rich people want to replace any living being with a silicon version ?

Gates took billions to reinvent the cow. My guess is that Bill wants to own all that land and crops that cows eat because he is a fucking moronic hoarder.