What happens when someone subscribes but set Shopify not to track inventory for the product?

Question: What happens if a product's status is changed for Shopify not to track its inventory after a customer subscribes to get a notification when it gets restocked? Will he still get notified?

Answer: In order for the app to work, Shopify should be set to track the inventory of the product. It is the only way for the app to detect if the product goes out of stock and get restocked so it can notify those who subscribed.