Good questions! I think the answers in both cases is a resounding NO. However, as Gabriel Weinberg mentioned in his post, DDG already displays content warnings

Good questions! I think the answers in both cases is a resounding NO. However, as Gabriel Weinberg mentioned in his post, DDG already displays content warnings on questionable sources and I would be very much in favor of that over outright banning or severely downrating sources. At the very least, if they choose to downrank, I would prefer they be transparent about the mechanics of the algorithm and specify which sources will be downranked. That way there is at least a mechanism for feedback should they make mistakes. Everyone makes mistakes and no algorithm is perfect which is why I prefer transparency to an opaque black-box algorithm.