Thanks for the feedback! We do support some blocks that Gmail doesn't have, and one of the popular uses for Block Sender is that you can create a block on one account that then applies to all of your linked Gmail / G Suite accounts. Plus bounce-backs and other canned responses.

Unfortunately we do need to charge for some features in order to pay for developers, servers, etc. And we'll never monetize the app using our users' data, so the small subscription fee is our best option.

Please contact me at scott@blocksender.io - I'd love to hear any other feedback you have and figure out how we can make Block Sender useful to you. Thanks!