You know, this is an interesting question. The site makes it, I think, abundantly clear that I don't really care whether you use the site or not, I made it for me and you can use it if you pay for your resources. It's even open source and you can self-host if you want!
Yet people in the comments seem a bit offended at the perceived breaking of the unspoken assumption that a service can't exist without a need for customers. Merely asking the question "why should I trust you?" implies that I want you to trust me, which I don't.
I think it's very interesting how deeply culturally embedded the notion that a service wants customers is. It's so ingrained that we even don't believe that something can just exist without wanting us to use it.
To me, this kind of feels like you coming to my house, asking me whether you have some of my dinner, and when I say "yes but you need to pay me for the materials" you ask "why should I trust you with my money?".