Can you elaborate on your point? Are you talking about Russian bot accounts, or that people in other countries may have views which are not suitable for Americans, or what exactly?
It's easy to point to 'oppressive' countries like China (where twitter is banned), or Turkey[1], or India[2] as examples of where speech can be severely limited, but there are many limitations to speech in other countries like Germany, Canada, France, Australia, UK.
When you make a globally available website, how do you "follow the law" when the laws of various countries are not compatible with each other? Do you geolock all tweets - Canada twitter is vastly different to US twitter? That doesn't sound scalable good!
[1]: https://www.article19.org/resources/turkey-twitter-becomes-l...
[2]: https://www.theverge.com/2021/7/6/22564768/twitter-india-leg...
Musk's Twitter is certainly going to clash hard with Europe's recently adopted Digital Services Act.