Property is theft from the commons - and here this is doubly untrue: the taxes are a reasonable level on a global mega-corporation with millions of people in near-slave conditions.
Depends on the legitimacy of government
In that case, you using any publicly funded service or good - including education, roads and defence, is theft.
I'm stealing free protection afforded by the galactic empire to the galaxy i was born in if i don't pay the already free protection they offer.