It is technically tax avoidance. Tax evasion = not paying taxes you legally owe, is a crime. Tax avoidance = using legal means to reduce the amount of tax you owe, not a crime (by definition).

This is why I support taxes such as those that France levies on digital revenue originating within their country. I also think it makes sense to wholly eliminate corporation taxes (which are not only avoidable, but are a form of double taxation) and replace them with these revenue taxes.