M: I believe it is the piece quoted by Joe here:
Their point is that in order to maintain a high level of seriousness, its talmdimim must be focused, to the exclusion of other focuses.
The idea was that if the institution is supporting you, then you need to be 100% focused on what you are studying there.
Im Kein, they should kick out married Bochrim as well, or Bochrim who have a side job of Laining, Moshgiach, or selling stuff on Ebay, etc. It is davka college education with which they have the issue.