IArt.
What doesn't work
Your claims of unique technology are false. A Next.js/Supabase stack is standard, not vanguard. Your 'double cypher' security is a basic, expected feature, not a competitive advantage. You're building a simpler version of existing software, which is an incremental improvement, not a zero-to-one innovation.
IIArt.
Biggest risk
Your entire premise rests on a simpler UI being a defensible moat. It is not. A competitor can copy your conversational interface in a week. You are competing on price and ease-of-use, which is a race to the bottom, not a path to a monopoly.
IIIArt.
Key question
If your only real advantage is a friendlier interface, what happens when a better-funded competitor copies it and offers it for free as a feature of a larger platform?