What are your thoughts about design subscription services?

We have been providing this service for a year now, so I can say that it is convenient for both the client and us as a service provider. Unlike project-based design services, no time is wasted on coordinating the estimate, the customer gets a quick result, as updates are provided every two days

Depending on how one implements their model, design subscription services can be a very smart way to go for companies and agencies alike. Now, this does require a competent knowledgeable designer(s) and speed while producing with quality, but the value of return is often so much greater than the cost. Companies pay for honest knowledge, value and results. If this can be accomplished in a design subscription then it is pretty much a no-brainer. Plus most design subscriptions have the ability for the customer to cancel or even pause whenever (within the monthly or time period basis). As @kozadoev said below it is often true that time is not wasted and updates are produced quickly.