Not familiar with the app, but we live in an HOA community (which we did not know when we rented as we were not told). A few Halloweens ago my daughter came back with our granddaughter from their walk around the neighborhood collecting candy and told about this.
Apparently a young boy was visiting his grandmother and wanted to go trick’or’treating, but he did not have a costume. She gave him a pillow case and he went out. My daughter and granddaughter met him and he mentioned not having a costume (they didn’t ask) and who his grandmother was. They said he could continue to go around with them.
But some neighbor had already called the police and put up a “warning” on the community Facebook site and this “black boy wandering the neighborhood” — no mention of trick’or’treating. When the police got their, fortunately my daughter and granddaughter (both white) were with him and “vouched” for him to the police.
I’m sure it might have ended differently had she not been there, because we also have an African-American son and my wife has startled and changed the attitude of police when she has shown up after he’s called for her when he was randomly stopped.
(Both of our kids are adopted, but our daughter happens to “look like us” as someone pointed out once.)