The terrorist ends wherever a threat to the state's power exists, it's been shown quite well that they don't care if you're domestic or not. This, IMO, is why "self-radicalized" and "domestic terrorist" were injected into our vernacular, to normalize and justify the need to surveil the general public.
The thing is, and like I mentioned in a post awhile back: technically competent actors, the ones bound to cause the most harm, would absolutely be using a bespoke method of covert communication. There's really little value, IMO, to the countrywide dragnet outside of sentiment analysis and control.
The military complex wove itself early into the tech industry in ways that they could intentionally side-step laws meant to keep such public/private collusion from happening[0]. The impetus for the founding of the collaboration was a report on the importance in controlling perception in future wars.
We saw the same strategy deployed directly against the American people during the election "fortification" where DHS and social media colluded to control perception with little regard for truth[1].
[0] https://medium.com/insurge-intelligence/how-the-cia-made-goo...
[1] https://homeland.house.gov/2023/11/06/chairmen-green-bishop-...