Not only is the forced opt-in a terrible way to do anything, but it acts as a usage restriction of the plugin which violates the terms of being hosted on the plugin repository.

WP plugin repository requires the plugin to be licenses as GPL and we are already complying with it. There's no restriction. If a user don't like anything in our plugin, then they are welcome to edit and use it. The optin is there to support the plugin. People only see the optin form, they didn't see the free support, free updates and free bug fixes we provide at our own expense.

There's a support link right inside the plugin to make the user easy to ask for support. How many plugins have you seen with so much dedication? People are afraid to put such link easily accessible because they don't want huge numbers of questions and support request coming there way. We dared to that and we are proud to provide such service at no cost.