Fun fact: United used to be part of Boeing. The two were split in 1934 when a scandal around air mail pricing led to laws saying you couldn't both make planes and operate them commercially.
We need a way more laws like this :)
I'll start with 3 off the top of my head.
1) You can't both make content and distribute content commercially
2) (More abstractly) You can't both make a platform and compete with sellers and resellers on that platform
3) You can't both make a mass or social media product and allow advertisers' concerns to dictate content
They're a bit sketchy but you get where I'm coming from I hope?