For a cheaper alternative from a trusted company, Google Docs has the feature.

Firefox has it built in now, too

Trust and Regulation like QTSP and all the other red tape

You’d be surprised how much trust people place in legal departments, balance sheet strength and talent capacity. All things for which I had to turn down superior technical proposals in the past. The old saying „Nobody gets fired for buying IBM“ still runs strong.

Free e-signatures are a great idea, have you considered getting a foundation to back the project and maybe taking out some indemnity insurance, perhaps raising a dispute fund?

That big companies use it for their important legal contracts.

its a well recognised tool for contract agreements, and you pay the money so that you are indemnified for any oopsies that might happen in transit.

Because when you send a document for a $75MM contract to be signed you want to send it via a well known and trusted document signing platform like Docusign where you know everything is legit and legally defensible.