Your litmus test isn't correct and your assumption of personalisation isn't correct either. All of the criteria that you see as fine are controlled under the relevant legislation and are considered personalisation, requiring transparency etc.
Furthermore, bills have been brought to EU parliaments that have erroneously attempted to ban all forms of ranking, which would include even the most basic information retrieval algorithms. So it isn't obvious at all what is meant by 'algorithm'.
Furthermore, bills have been brought to EU parliaments that have erroneously attempted to ban all forms of ranking, which would include even the most basic information retrieval algorithms. So it isn't obvious at all what is meant by 'algorithm'.