Interestingly, this is why Shopify has really strict guidelines for their Theme Store: (https://themes.shopify.com/services/themes/guidelines)

"Being a Theme Partner is a full-time job."

"Shopify themes need constant care and attention. We expect Theme Partners who work with us to be engaged, passionate about their theme(s), and apply any theme updates we request in a timely manner."

"Our current Theme Partners are a tight-knit group of people."