This is probably the best way to do cloud computation offoading, if one chooses to do it at all.
What's desperately missing on the client side is a switch to turn this off. It's really intransparent which Apple Intelligence requests are locally processed and which are sent to the cloud, at the moment.
The only sure way to know/prevent it a priori is to... enter flight mode, as far as I can tell?
Retroactively, there's a request log in the privacy section of System Preferences, but that's really convoluted to read (due to all of the cryptographic proofs that I have absolutely no tools to verify at the moment, and honestly have no interest in).