These are not illegitimate. They are registered 3rd parties facilitating the government. At least the ones that are on the list are not.

I got one from passportsfast or something. Highly recommended (if it's registered)

> https://travel.state.gov/en/passports/apply/get-fast/courier...

I hope you realize that there are legitimate third-party services which assist with passport applications and filing paperwork, generally in the capacity as a courier. Similarly, in my state and others, there are third-party services which operate as storefronts in under-served communities, that provide services as the DMV office would.

So it is unclear how you determine that they are definitely scams, unless you have attempted to trace each one through referrals or official links from the government office they are representing. Some don't have any link, though: the passport assistance services may be operating independently as middlemen. Is it worth paying someone to assist you with paperwork? Do you only speak Laotian?

In general, for any government service, there are usually middlemen who'll assist you in filling out paperwork and getting approved. That includes Medicaid and the IRS and Social Security. Of course, some of those assistors have licenses, or represent a facility. The passport agencies may not need any bona fides like that.

On the other hand, if a service is advertising "TSA PreCheck" services (and not simply intercepting your keywords to advertise unrelated stuff) then there are only three authorized partners: IDEMIA, CLEAR, or Telos. But I bet you that your keywords are simply triggering some adspam.

Doesnt help, when official government websites ( usps.com ) are on the commercial suffix, and not .gov