This is about two consenting adults not being able to exchange text messages with each other because the middlemen censors do not approve of the contents.
I highly, highly doubt that anybody is going to the mat over this unless they believe in banning abortion. No definition of free speech includes what sms middleman can or can't do.
And it's not even quite true anyway. The phone system has federal mandates. It's recognized as a piece of infrastructure that that the state has an interest in, and so is not actually 100% free to do whatever it wants in the way that say, BestBuy is. And plain sms is part of that basic telephone service.
But even if they were, legally, free to violate the integrity of the communications they have been entrusted to carry, why in the world are you ok with that?
There are countless things that are legal and wrong, and I see no valid reason not to see something wrong and say "that's wrong".
it entirely matters if it's a private company. this isn't 1995. there is no regulation anymore. you can't compel anyone to transmit whatever hate speech people deem "Free".
so, they are already expected to "violate the integrity of the communications" they handle (whatever that means).
this isn't 'nam, donney. there are rules.
Censorship of libraries and press in the pre-internet era is completely different than preventing new copies of stormfront being shoved down everyone's proverbial throat on a daily basis.