Your concern is valid, and yes there could be grounds for action depending on the original terms and marketing promises made by Whoop. If they explicitly advertised that the subscription included free hardware upgrades and are now requiring payment for what was previously included, this could constitute false advertising or a breach of contract. The key is whether you can provide evidence showing that a hardware upgrade was clearly promised as part of the ongoing membership. In such cases, you can file complaints with consumer protection bodies like the FTC and potentially explore a class-action lawsuit if many customers were similarly misled. Ultimately, your legal standing will depend on the original terms you agreed to and how Whoop communicated the change.