Presumably, you mean schools where there is not a high barrier to entry to the major for students not directly admitted to the major as frosh?
UIUC would be an example of a school which would not be desirable for a prospective CS major who is not directly admitted to the CS major as a frosh, since a 3.67 college GPA is needed to do so later (but apparently does not guarantee admission):
https://cs.illinois.edu/prospective-students/undergraduates/transfer-students/transferring-another-university-illinois-major
https://wiki.cites.illinois.edu/wiki/display/ugadvise/Want+to+Change+Your+Major