That strikes me as a pretty extreme reaction. If it's an issue you care about and you think it's a viable approach, you'd really withhold your contribution on the basis of a required email address?
I have no idea if they plan to do this, but I suspect they might (otherwise why would they require an email address?) and the onus on them to prove they don't intend to do that. Claiming you want to do something good doesn't automatically win everyone's trust.