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"soliciting"-> asking, "exploiting" -> giving without expectation, "unethical" -> seems to be back to the asking.
It's worth also considering that not only has the ask been transparent - no false promises given, and doesn't target any individual, but many of us know BRP to some extent either online or IRL, and really we can make up our own minds whether we want to freely give him money or not. It's a nice thing, if that makes you uncomfortable maybe reconsider why.
It's not the giving that I have a problem with, it's the asking.