Possible Integration with Domain Access

It would be Domain Access's responsibility to keep track of which terms apply to which domains, so I am going to pass this issue to Domain Access.

See the Domain Taxonomy module --> http://drupal.org/project/domain_taxonomy though I don't know if it is Views-integrated.

Sorry for passing you around here... but I expressly handed off all domain-related taxonomy stuff.

With this module (Domain Taxonomy) you can assign terms to specific domain. And then in views term-based queries domain filtering will be automatically active.

"And then in views term-based queries domain filtering will be automatically active."

This appears to be true only if the primary views table is a "node". So, term-based views (those which filter lists of terms) do not appear to have any views support whatsoever. I have been debating about whether to implement this myself, but waiting to hear what the module maintainer has to say. Maybe this is already in the works.

The view support you are describing is inherited from Domain Access, not specifically a part of Domain Taxonomy.