Do You Really Need a Website to Start an App Growth Agency?

Started helping a few founders with ASO + retention. Got paid $1.5K/client—realized there might be a market here.
No website. Just referrals, convos, and a refund-if-no-growth pitch.
It’s been working… but wondering:
:question: Is a website a must for scaling?
:question: Anyone here growing without one?
Would love your take—especially if you’ve built in public or bootstrapped services.