So I'm going to jump on the bandwagon and add my two cents real quick.
I think that, optional or not, the sharing taints the game for me. I compare it to going to an amusement park, only to get inside and see that some of the rides have disclaimers that they have a high injury rate. The ride operators say "these rides are optional though." First off, if feels like a bait and switch. Secondly, it makes you wonder what the rest of the park is going to be like.
The same holds true here. Sure, the sharing can be disabled (and to not have the switch at the beginning of the game feels dishonest to new players), but more importantly it doesn't leave me with a lot of hope for the future of the game and the scenes to come.
Thankfully there's tons of other games that don't have this problem, it just disappoints me to see this direction, especially after supporting the game for the last 3-4 months (which I'll be cancelling at the end of the month).