Is an act of kindness invalidated if you use the act for personal gain?

I bring this up because of what happened with Mr. Beast and the internet's response specifically. He funded the surgeries of 1000 people internationally to restore their eyesight in exchange for him to be able to film and monetize the video. The argument could be made that this line of entertainment (making people's lives better for the heartwarming effect the story tells on the audience) falls in the same line of voluntourism when you volunteer to build a school in a 3rd world nation despite knowing nothing about construction.

With voluntourism specifically, people in the area will go out of their way to make the children seem sadder and more pathetic to gain sympathy, telling them to hide their toys so they get new ones, put dirt on their faces so they seem more helpless, etc. I don't know that Mr. Beast went out of his way to ask these people who he gave surgeries to make their lives seem somehow worse than they were for the sake of the huge happy turnaround when they got their sight back, but I'm curious what others' thoughts are on it.

His entire platform is built around being rich and using those resources to give back to people for the sake of views and monetizing his videos. It's part of his income, does that invalidate the kindness he might have intended?

Is an act of kindness invalidated if you use the act for personal gain?
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