The most evil thing a tech company has done is make a proprietary messaging app?

Apple didn't make SMS bad, it just was. Apple has since implemented RCS and it hasn't changed how I communicate with people from my iPhone at all.

Google should probably take most of the blame for repeatedly fumbling messaging on non-Apple platforms for the past 2 decades. Every time they had something that was getting any amount of traction it got quickly replaced with some stupid new, worse messaging app so a PO could get a promotion.