What if Google and Twitter deside that those "alternatives" are hateful for disagreeing politically and stop linking them on their platforms making it extremely difficult/impossible to find them?
What does Google have to do with this discussion about Twitter?
I think your parent is talking about Twitter, Google and the other internet platforms and infrastructure.
Then people can type in domain names directly. This isn't a hard problem to solve.
Sounds like a private enterprise deciding what they want on their property, to me.
It's not because there are alternatives.
People keep forgetting that 1984 assumes a singular authoritarian control, not multiple authorities and the freedom to choose one, several, or none of them.
If you're interested in hateful content stormfront is the next door down