I don't think you understand. If I decide as the owner of a site, that I don't want you scraping my business and I block you, then I am in that position. I'm automatically in that position because I can implement the blocks necessary to uphold the the terms of use of my business, or I can just do it for arbitrary reasons. Maybe you are hammering my server. Maybe I'm in a bad mood this morning and don't like that you're using Python.

I can unilaterally decide whether or not you use my business, in any way shape or form, even if I just don't like you, as long as I don't violate any laws (discrimination etc).