FWIW I know of 3 invited speakers and a sponsor who decided not to come as a result.
I would love to know who else this was a major consideration for not attending, and what their thoughts are. I think this kind of protest is more effective if you at least let me (the organizer) know, and possible better if you also post something online publicly. At the same time, I totally understand if you'd prefer to just not speak up or stay anonymous, it's not your responsibility to do so.
I would appreciate a direct message (eg email firstname.lastname@example.org), but nominate @NathanpmYoung as the person in this community who seems trustworthy to me if you want to reach out and have someone know (Please confirm if this is okay with you Nathan, I didn't check before posting this).