They may have been embellishing that claim; however, I think what they were getting at is that in some situations using the chargeback mechanism can have wider repercussions. For example: if you are "ripped off" through Steam on a particular purchase and use a chargeback, they may shut down your account. In that case, you would lose access to all of your games purchased through Steam. Similarly, if you use a chargeback with a Google Play Store purchase you may lose access to your entire Google Account.

An example: Uber drivers requesting fake cleaning fee was recently discussed here on HN. Uber refuse to handle it properly, so people solve it by doing chargebacks only to find themselves blocked from the service.

Also heard it with lots of other vendors, but won't name without having something more substantial to back it up with.

I’ve seen Uber respond to a chargeback by leaving the account active but disallowing all payment methods. With most companies I’d expect it was a customer support mistake rather than vindictiveness, but with Uber it’s hard to be sure.