Jot form is a paid service isn't it ? and clients really like to have their data available inside of wordpress its easy to use and increases SEO from having the form on their own website. Also you can create multiple forms, routing and more inside of gravity forms. I just migrated a client from jotforms.
Not necessarily. They have free accounts. We also offer it to our customers as we have purchased the software from them to run on our own servers. The support is extremely limited if you decide to purchase the software to run on your own servers, so you must have a developer in house.