This looks like a straight up request for charity. As they say in their blog post, they will not be able to offer any new features, at the current time, in exch

This looks like a straight up request for charity. As they say in their blog post, they will not be able to offer any new features, at the current time, in exchange for you subscribing. I would feel uncomfortable with that business model, if I was them. Admittedly, National Public Radio survives that way, but then, NPR is registered as a non-profit, and donations are tax deductible.