I think you have it backwards. The biggest companies that are already avoiding taxes can justify the lawyer costs to do it again.
Besides, they typically already have dozens of subsidiaries that are largely invisible to most employees and business partners. This is just adding more reasons to do so.
(Source: have worked on subsidiary taxonomy of large companies before, not for tax purposes, and from the outside there is often little information, at face value, why these subsidiaries exist. Even if you asked them, it wouldn't be hard to come up with legal reasons.)