It absolutely is effective.
As commented above, the companies are required by the Fair Credit Report Acting Act abide by the requests. [1]
[1] https://www.consumer.ftc.gov/articles/pdf-0096-fair-credit-r...
As commented above, the companies are required by the Fair Credit Report Acting Act abide by the requests. [1]
[1] https://www.consumer.ftc.gov/articles/pdf-0096-fair-credit-r...
The do-not-call has been fantastically ineffective for me. I imagine this could be the same. It's also possible that all of the companies strictly adhering to the FTC rules (i.e. those on the OP site) constitute a minority of the market, and spammers are getting data from other less scrupulous sources.