Because I want to retain ownership of the data. Transmission is transient and I'm ok with outsourcing that to a little-known company, however storage is lasting

Because I want to retain ownership of the data. Transmission is transient and I'm ok with outsourcing that to a little-known company, however storage is lasting and I want to retain meaningful control over it. I understand that ties you to AWS and restricts your future options, but this might be a good place for you to start - targeting existing AWS users who need a little bit of extra automation.