Two months notice and a huge price increase ultimatum. This heavily affects a lot of Discourse open source installs as we recommended Mandrill as an email provider for almost two years.
Free product so they can do what they want, but this feels a bit abrupt (how about six months to transition) and cruel (forced MailChimp account plus giant leap in pricing).
Would it cost them so much in brand loyalty to be a bit more generous with time to transition and cost?