Why the big three accept all the transfer credit?

Why the big three accept all the transfer credit?

I know that a student has to complete two to three classes "residency" yet most other universities and colleges have a limit of up to 75% credit transfer toward BA/BS degree.

Is it because of policy and each university can change their policy or some special state law etc?

 

To put it into everyday language:
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Not really researching it, can someone with first hand knowledge of accreditation policies confirm that the RA bodies require that students complete at least 25% of their degree program through a school in order to earn a degree there? I would think that because of the special mission of the big-3 and having originally been approved by their RA bodies that they would be fine going into the future, but other new schools wanting to utilize a similar model would either face intense scrutiny or be denied all together.

 

A little history

A little history about the acceptance of transfer credit from Excelsior College formerly Regents College. As was explained to me years ago from my Military Education officer, many folks serving in the military would attend local colleges where they were based. After a year or so at that assignment, the service member would get transferred and and reapply to a new college. Unfortunately, the new school would not accept much of the coursework in transfer although it came from regionally accredited schools.

In order to accommodate the needs of these military folks and not waste time and money repeating coursework, schools like Regents College established programs that accepted credits from all regionally accredited schools as wells as credits from other sources such as the GRE, CLEP, ECE, TECEP, Dantes, etc. This was a great blessing to tens of thousands of students who had a fragmented college education by no fault of their own.

 

Thanks for the replies.

I hoped to learn something about the legality and if other legitimate/accredited universities can change their policy and start tomorrow accepting 90% or 100% of the degree in credit transfer?