Your premise is wrong.

I’d wager that Twitter has fewer engineers and programmers than a wireless company does to send and receive text messages.

And a wireless company doesn’t need to have special programs to sell advertising and bill the advertisers. “Anytime someone mentions a baby or shows a picture of a baby in these countries, but not if the content is political or abortion related and only if the viewer is a woman I want Bye Bye Baby advertisement inserted if it’s below this price per impression and I haven’t reached my cap for the day.”

It also doesn’t have programs to stop hate speech

It also doesn’t have to spot child porn

It also doesn’t have to comply with different laws in different countries such as not criticizing the royalty in Thailand or allowing anyone in the EU to purge their data.

It doesn’t have to monitor to make sure children aren’t signing up.

It doesn’t have to check to make sure users aren’t bots.

And so forth and so on