Services like email don't have a high barrier to entry and most customers don't have complex technical requirements, so much of choosing a provider is based on trust and instinct - rightly or wrongly.
I remember a while ago someone promoting a new email service that "focused on privacy", etc. A few knowledgeable HN users quickly pointed out they were running Mail-in-a-Box on a single Digital Ocean droplet.
Your open source link contains nothing, your blog has no posts, your Windows app is not found in the store, your privacy policy is from a free policy generator tool, there are no reviews due to the service being new and there is no documentation for how to use custom domains, etc. You may offer an excellent service, but there's not a lot to base trust on.