I know @giftedgaia has some input on this, as his niece just recently had an article written by her mother go viral on this exact topic. They ended up on Good Morning America over this.
"Why this mom is teaching her kid not to share"
https://ca.style.yahoo.com/moms-post-teaching-kid-not-share-goes-viral-191955466.html
Thanks, great story! I would say that's a smarter mom than others who let peer pressure and "gooney" demands to MAKE someone share. That's not how sharing should work. All the kids are just bombarding him asking him for his toys, likely many just using him and pretending to like him so they can get the toys.