A lot of software and membership sites (not this one, otherwise I would not be telling you this trick ) have trials. In some cases this just goes by what email address you have, so if you have an unlimited supply you can get a lot of free trials for the same product.

Not many people have a lot of email addresses though, and they can be a pain to setup. I use https://www.guerrillamail.com/ for a few things so I never have to pay. Such select a different domain or 'forget me' for a new address to use.