all previous versions still have the open source license, so people can fork if they find it so distasteful.
> only I can profit from this
no, thats not true. nothing is stopping anyone from buying a commercial license from me, and then making money from the software after that.
That's a legit complaint, particularly if someone contributed to it, gave feedback, was part of the user community, depended on it etc and would have chosen differently it they knew it wasn't open source. You changed the terms from "everyone can profit from this" to "only I can profit from this" which is a pretty big change. It's your right, but it shouldn't be surprising people don't like it.