I believe an X mirroring service will count as a single “daily active user” for the X numbers, no matter how many actual people are accessing the information downstream of the mirroring service. I don’t use that number myself, so I’m not sure how it is calculated.

I can operate without X. But, not everyone can. For example, there are governmental organizations that only publish announcements on X. So, some people are going to need to use a mirroring service (or X itself) until they can get entities outside their direct control to change behavior, which always takes time.