The whole thing sounds strange to me. What are those services offering?
Here is their blogpost about it:
https://www.namecheap.com/blog/domain-privacy-is-changing-at-namecheap/
Though you were paying Namecheap, it was provided by WhoisGuard (http://www.whoisguard.com/). Now it's being provided by "Withheld By Privacy". A quick search doesn't turn anything up on this company/provider, though. Maybe it's a new company, or maybe it's a subsidiary of Namecheap.