With free trials, I can understand revoking the benefits once the subscription has been canceled. While I can understand the consumer's perspective of not wanting to be billed for future months (say if they forgot to cancel), free trials are intended to attract future customers. If a person signals that they are not going to be a future customer, why should the business offer the free service?

Sorry, but they set their signaling mechanisms so that that signal is worthless. How many people who don't cancel want to signal they are going to be a future customer, as opposed to it being an accident? How many people who do cancel do it to signal they don't want to be a customer, and not because they don't want to be automatically billed? I believe the answer for both is "not many".

I think the companies do it because it benefits them, and because they can.