When you search "us passport" or "tsa precheck" on Google, you constantly see promoted ad results impersonating government sites (ie passportvisarush.com or easegov.com) extracting and selling your PII (social security number, etc) from your application. I've reported the ads multiple times, but new ones still end up being promoted. I'm sure these companies have mined and sold thousands of SSN/address/DOB info from u…
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.