It looks like the middle "Default Safety" row is the normal mode however, and that doesn't seem particularly onerously restrictive. It seems to only be blocking actually NSFW sites, plus selected pages on Reddit, Tumblr etc.

The bottom row appears to be an (properly) opt-in service for much younger kids that must be whitelisting only a few destinations, which is not the same thing at all as the filters that Cameron et al are pushing for.