Even so, I'd assume that a company that knowingly infringes on the GPL is much less likely to demand free support, lest they draw attention to their violation. So at the very least it should free maintainers from having to deal with bug reports/feature requests/entitled demands from corporate entities that refuse to give back.
None of the Apache PLC4X users asking for free support on behalf of their companies mentioned the company name nor used a company email address. I expect it would be pretty easy to keep the gratis support requests and GPL violations fairly separate.
