For most users having to mail a file to someone is way more work than having to just share a link. The cost of cloud storage is almost nothing (since email is mentioned I assume 50MB max per project). A notes app that don't sync between all devices is just a text editor to most.
I do like apps that have sensible export formats though. Having control over my data is important.
I do like apps that have sensible export formats though. Having control over my data is important.