In my opinion, topics about deadly diseases have no place in a 365 photo challenge.
It's perfectly fine if someone wants to devote their blog to any illness / disease they want, if it is based on their own initiative. That's their choice.
I object to the fact that the topic of breast cancer was mandated through the 365 challenge. Where will this lead? What other deadly illnesses do we have to look forward to on the 365-challenge calendar in 2020?
A better way to have handled this for a 365-challenge would have been to be more open-ended like: "your favorite charity / cause" and leave it up to each individual, although I would recommend to avoid such topics altogether.
Initially I considered to boycott today's topic out of principle, however, I decided to voice my disapproval as a protest in this blog in order to positively influence the calendar maker(s) to keep the focus on photography topics in the future.