This question applies to the Starter plan, which is rate-limited. The Pro plan is not rate limited.
OrbitKit throttles publishing per platform, not per venue. Even if you create ten (say) Teespring venues, OrbitKit will only publish your quota per day across all of them.
OrbitKit does not apply a throttle to OrbitKit Fulfillment venues, OrbitKit Fulfillment Alternative (Printful/Printify) venues, or organizations with the Pro plan.