Why does that difference matter?
The social media platform never allowed you to air any opinion you wanted to. They've always had restrictions on how their services could be used.
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Go on, link me to the law barring discrimination based on ideology.
You absolutely can.
Discrimination law in the U.S. is based on "protected classes." Those protected classes are race, color, national origin, religion, sex, age, and disability. Not political ideology. There is no bar for discriminating against political ideologies. I can ban people from my business if they're Republicans or Democrats. The fight to include sexual orientation among these classes is basically what the bakery case is about, with the conservative justices saying, essentially, that they don't think sexual orientation (despite it being inherent and immutable) should be a protected class.
And regardless of this: these laws only apply to the government, and businesses that are sufficiently public-facing (which Twitter would qualify for). If you're private membership, you can discriminate against anyone. It's why Augusta National was legally allowed to exclude black and women members, until actual social pressure pushed them to change that (but not a law).
Twitter, though public facing, has no obligation to platform people of every ideology. However, Twitter couldn't ban a person for being black, for example.
There is no absolute right to not be discriminated against in a private business, even if it's forward facing.
This ought to be self evidently obvious even to cuckservatives.
Do you really want the next Osama Bin al-Baghdadi or whatnot spamming your Twitter feed with Death to America memes and Jihadist ideological messaging, while going "Can't ban me infidel bro! Free speech!"
Why on earth would you?
There isn't a country on the planet that does that. It would mean having to allow terrorists to campaign and propagandize without legal repercussion (for instance). Hell, you could probably make a solid case for protecting child pornography under those precepts.
It's a bananas cuckoo idea.
Tech giants are becoming so large that they are in a position to easily suppress human rights like freedom of speech if they wanted to. They should 100% be regulated in this way.
Freedom of speech protects you from the government not private companies and it's not freedom to have a platform. Under your thinking I could break into your house to give a speech and if you kick me out that would be infringing on my freedom of speech. You have no right to be given the freedom to speak or say what you want wherever you want without consequence.
Why? Political party or ideological definition is a choice, not an identity or a part of who you are like being Black or LGBTQ+ or disabled.
Why would a country protect political identity like that, especially when we have political identities that include Nazi's where their ideology necessarily requires genocide?
To augment this bit, the only reason the Fairness Doctrine withheld scrutiny for as long as it did in the SC was because the gov't was regulating the frequencies that people could broadcast on. As there was a limited amount of spectrum to use, there was a legitimate concern about the sale of frequency spectrum by the gov't, as that actually did, in a very large way, mean the gov't was choosing who got to have speech rights (thus the required equal time provision). Since there isn't a limitation on frequency spectrums for the internet like there is for broadcast (and the expansion of cable TV before it), the equal time requirement lost relevancy.