>>102695461money and comfort, they want to retain as much of their audience as possible if they plan on continuing their activities as indies/other corpo affiliates afterwards.
whether their reason to leave is because they don't want to take part in the increasing focus of Live Events/Sponsored style content that require constant traveling/physical activity, or lower contract returns if not partaking in them/streaming less in general, or simply because of personal relationships like marriage and possibly even having children.
giving out a blanket "disagreements" statement serves them better than an honest answer because that could negatively affect the way their fans view and support them in the future.