If you look at the mod that's hosting the poll they never even left the site. This doesn't feel like something they're doing for the benefit of the community, it feels like they're doing it because they're addicted to the platform and aren't willing to make a community elsewhere. It just happens that they can open a poll and all the people that already left aren't going to have a chance to say no.

Not too mention that they're hosting it on Reddit itself, which requires an account to vote on polls. When many people already deleted their accounts.