The Equifax breach was worse than anything I can recall off the top of my head from Experian. Did you mean Equifax?
In any case, the damage caused by the Equifax breach was mostly to people who consume financial services individually or as couples - consumers getting credit for various personal purchases. They're not Equifax customers. Equifax customers are the providers of financial services.
"People" have very little say in whether their financial-services providers use Equifax. They can ask, but there may not be any viable alternatives (for example, using a local credit union is often better than using a national bank, even if all the local credit unions insist on using Equifax); or using an alternative may be expensive because they don't offer as good a rate.