Should you choose not to sign up for a subscription you will no longer be able to access your Wink devices from the app, with voice control or through the API, and your automations will be disabled on May 13. Your device connections, settings and automations can be reactivated if you decide to subscribe at a later date.
Hubs like the Wink Hub 2 and the SmartThings Hub were important precursors to today's Alexa- and Google Assistant-dominated smart home. The idea was simple: to unite all of your various smart home devices under a single, universal app. So instead of having to switch among Nest, Philips Hue and Wemo, everything would live in your Wink app. In reality, I found the Wink app unwieldy due to the sheer number of integrations it tried to manage. Wink's third-party version of each app interface was rarely as easy to use as the standalone apps.
Wink decided to delay the launch of its subscription plan to May 20, noting in a blog post that, "It was not an easy decision to switch to a paid service, and we know that the short timeline put a lot of pressure on all of you, but we had no other way to continue the Wink service as it is currently known." Then, it was delayed a third and final time to July 27, when the subscription plan officially went live.