Apparently Steam used to have a policy of shutting down the accounts of people who did too many chargebacks, locking them out of whatever else they'd bought before. [0] I'm not sure whether they still do, although their refund policy has changed since [0]. I'm also unsure if it's even legal to do this, especially in countries with consumer protection laws.

[0] https://news.ycombinator.com/item?id=14545053