Something along those lines already happened…

https://www.pcgamer.com/ransomware-abuses-genshin-impacts-kernel-mode-anti-cheat-to-bypass-antivirus-protection/

Tbf, they did recently (I think) implement a feature where Edge would open with the email in a sidebar when opening links from outlook. So at least there’s some point to it… if that’s a feature anyone actually wants…

Funny you should use Big Mac as an example, since McDonalds actually lost that trademark in Europe due to some legal dispute with a pub in Ireland or something