Thanks you so much for the feedback. - It is free; and I know we should be more vocal about that. - We will make money on the professional organisers at some point. Looking into different models with a bunch of different organisers.

It's probably worth making this clear up front. If I see that a service is free, I assume advertisements as a business model, which I believe is fundamentally at odds with any claims of privacy and transparency, which your service also claims. If the users are not paying you, your financial incentive to protect their privacy is not clear.

Added a bit more copy on the frontpage, to make it clear that it is free to use the platform :-)