Ok thanks for the explanations. Yes in some cases this seems like simpler than Google Drive etc. — I'm wondering though, if that's enough to make people want to try this. I've never sent a file larger than what I can already do via Dropbox etc.

Maybe people who send 10 - 20 GB files typically already have Google Drive accounts or something like that? .... They're not "normal" people. I've been developing software for 10+ years and never had the need to send that large files.

I agree about encryption, I would probably encrypt something also before uploading to Google. (In fact I do, already, any important stuff of mine.)

Book tips: http://www.startupwerkboek.nl/startupcenter/Momtest.pdf — it's about how to find out if a service like Seven Words is needed, without writing any code. The i.m.o. "most important" part is free: the first few chapters.

Best wishes anyway.