Hue Hub Pro - what is Internet access for?

Recently moved from a hue hub to a hub pro. Everyting is working, both in the Hue iPhone app and Home assistant.

Going through HA under the Hue Hub pro I spotted a toggle for internet access - it is off and greyed out. Just wondering what it is or does and why it is greyed out. Everything seems to work, and I can’t test by toggling it on.