Probably because they don’t meet IRS standards for nonprofit status:

An organization may qualify for exemption from federal income tax under section 501©(3) if it is organized and operated exclusively for one or more of the following purposes. • Religious. • Charitable. • Scientific. • Testing for public safety. • Literary. • Educational. • Fostering national or international amateur sports competition (but only if none of its activities involve providing athletic facilities or equipment; however, see Amateur Athletic Organizations, later in this chapter). • The prevention of cruelty to children or animals.

My guess is more like they found out that several big places were making big bucks off of what they were offering for free, and they want to cash in on the profit being made.

Uh, nope, not me. (not necessarily a radical right, just more like an Anabaptist right although I’m obviously on a computer so I’m obviously not a fully Anabaptist right) I will keep a token (and only a token) presence there until something changes, and I’m looking for a new place to call home with all the subs I like. I understand that the owner didn’t like giving away the content for free to those who are going to benefit from it financially, but it should have been a more collaborative brainstorming for a solution.