Every account holder has up to $250k in coverage from the FDIC. This is individually, not in aggregate. We say this on our website, but anyone who wants further confirmation could email Evolve directly and they would confirm this.
So I'm unable to get confirmation from the FDIC-insured bank that you're using that their FDIC insurance extends to your customers. Sure, I can contact Synapse, but I don't know why I should trust what they say any more than what Yotta says - Synapse isn't FDIC-insured either.
While looking for this, I also found a medium post by Beam (https://blog.meetbeam.com/a-primer-on-fdic-insurance-72fe688...) who explain how their savings accounts are FDIC-insured upto $250,000 for every customer - they would open an account in every user's name at Evolve bank. Perhaps it would help you gain more trust if you did a similar post.
Good idea on the blog post. I think we will do a post like that.