The rest of them seem to be scams.

It was a weird experience, but it worked. Observations were coordinated through the on-line place, there was student teaching. I wound up better prepared, to be honest, than some people who went through the same sort of post-BA training in person, mostly because the program insisted that I physically be present not in the classroom of the instructor but in the classrooms of actual teachers teaching my or related topics.

They can be scams. They don't need to be. (Walden, which I had never heard of, is huge. Can't find that they even have a physical presence, but they sort of make up for the fact that their student body is all over the place. They have "residencies", several-day meet-ups in various cities and countries to get the students and their instructors together, whether for tutoring, counselling, or dissertation review/revising. Very strange. But since a lot of the students appear to be full-time already, not unreasonable.)

A number of brick-and-mortar universities also have similar kinds of on-line certification and degree programs, some targeted for in-state students, some for US students, others for international students. My wife took some courses through NAU (Northern Arizona). Oddly, they required that she update her immunizations just in case she ever step foot on their campus.

Others are not.

With buildings they have leased all over the country and not a real campus.

for what they provide.

I'm sure a similar survey on undergraduate diploma mills would turn up places like Art Institute International and others like it.