I Had to Stop Inviting People to My Island Because of Thieves

I love hosting giveaways and helping others in Animal Crossing: New Horizons, but I had to stop letting people come to my island because other players like to steal everything. I try to be nice by helping people out, but it’s really disappointing when others take advantage of that.

For example, I invited someone to my island because they needed bells, but after they took the bells, they refused to leave and started trying to steal from me.

Now, I have to be more cautious about who I invite, which takes away from the fun of hosting.

Has anyone else dealt with this? How do you handle players who try to steal during giveaways?