For D2C founders in 2025, growth isn’t just about running ads — it’s about speed, strategy, and scaling smart. While freelancers offer flexibility and in-house teams bring alignment, a growth marketing agency delivers what lean teams need most: cross-channel expertise, faster execution, and clear accountability. This blog breaks down the pros and cons of each option — and explains why, for most bootstrapped or scaling D2C brands, partnering with the right agency often drives the best ROI with the least operational drag.