Are clients not interested in learning how to build scalable software themselves? Just curious about it, since it's not mentioned in your services.
The typical client is a 40 years old ex-CTO, that had idea, verified it with Claude Code and got to the point, where the repo is too big. Maybe even rewrote it all from zero, once or twice, but end-up with the same outcome after adding more features.
He can either hire a developer to work on the codebase and refactor it or hire 3party company.
Sometimes the requirement is a security review. And you pay much less if you downsize the repo before handig it over.