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This surprised me, House Sparrows here in the UK seem to get along with other small birds just fine, I never see any aggression at feeders or in the hedgerows.
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So, considering adaptation would take years and depending on widespread adoption, this seems a very useful tool to employ for some time. Very far from “stupid things humans do”.
Arbitrarily prefer on bird over another, and believe that you can do something about it with passive-aggressive architecture. That is neither dog stupidity, zebra stupidity nor jellyfish stupidity. That is human stupidity in action.
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House Sparrows are invasive in the United States and they are very aggressive. They destroy the nests of native birds to eliminate competition.
That is peculiar. Because in the Netherlands the native house sparrow population has declined significantly since the '90s.