Are startups that have collected data on 50% (or even 10%) of the US population still small enough that complying would be burdensome? The answer here depends

Are startups that have collected data on 50% (or even 10%) of the US population still small enough that complying would be burdensome? The answer here depends a lot on what the hypothetical regulation would be. Does anyone know how many consumer oriented startups reach 30 million customers?