I was surprised that I couldn't find a solution to this in the wild, so I put VaultForm together to solve that problem for me. Then took it a little further to make it client-side encrypted so the server can't know anything important. This way anyone filling out a form can be assured their private information is safely transmitted, can't be viewed or leaked by the service, and don't need to sign up for a new service to do so.
By contrast, NextCloud's drop would entail emailing the user a set of attributes, asking them to create a document locally, then uploading. Adding to that not every business would know how to, or want to go through the process of setting up their own web server for this use case.
My thinking is that this private forms approach would be a better default compared to email or text, which is how many businesses are handling this data today.
