I'm sure these problems were also difficult for DocuSign in the beginning.
No open source startup is going to win there because it's about entities and process, supported by technology not technology on its own. The technology is absolutely worthless without the framework and legal entities surrounding it. It's a unique position no one really understands that well.
A digital signature is a legal construct that stands up in court.
The movement might have begun, but you need to change your perception. You have to stop talking like a technocrat and address the business problem that signatures solve.