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What if the speakers aren't treated well or are not adequately compensated? Yes, still not professional to not state something, but might be another side to the story.
Simple, don't confirm your talk if you think you're not being fairly compensated for your time.
Unless they pulled a "uh, by the way" at the last minute.
Speakers at conferences like these aren't compensated for anything by the conference, unless (sometimes) they are a big keynote. It's paid for by your employer or self-funded.
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