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Reading this article, it seems that terahertz is only suited for space-based telecommunication.

Given its super high transfer rate, it would be perfect for a low orbit, internet-providing satellite constellation. cough starlink cough

It might be great for satellites talking to each other but as TFA points out, terahertz is basically completely absorbed by the atmosphere.

Attenuation in atmosphere is extreme. But this can be seen as a plus if you want to limit interference (try wifi in a crowded mall)

You don't have to go full terahertz for that. Just look at the difference between 2.4ghz and 5ghz wifi.