So, as a user, you have a right to a free product on your terms and conditions?
The idea that because it's free it's above all criticism is simply unreasonable.
Personally, I don't think requiring payment for SSL is wrong, though.
Solution: shut down the free version. Addressing complaints from free users who demand things captures absolutely zero value when you're a struggling startup with too much else to do and limited resources still trying to make a viable business. Freemium doesn't work unless you're swimming in VC money and only care about user growth, not MRR growth.
Providing both free and payed tier is the way to go, especially in the commodity market segment like RSS readers, unless you are in a niche without too much competition.