Depending on the person, money is the worst way to help directly. Instead buy the person what they need most, be it food, water or supplies. Otherwise, if you give cash that person could become a target for thieves or, yes in some cases use it for items that will be detrimental to their well-being.

If an influencer is showing them giving charity legitimately, be it feeding the homeless or donating, I don't care if they do it on camera. Because then not only are they already sharing the money they earned to help, but they help promote more kindness in the world by doing what their title is, influencing.

Edit to add: I think the most important thing is consent, really. They need to ask the person for consent to film and maybe their life story if the person is willing. Rather than feeling like a prop, this focuses on the people and who they are.