The company would have to not have any interstate presence at all. If you are a business based in the united states that has customers in California, you are easily reachable under California law.
That’s not much of a definition.
A seller is deemed to be doing business in the state if the seller solicits prospective purchasers from locations in California or solicits prospective purchasers who are located in this state.'
<https://oag.ca.gov/consumers/general/telreg>
The DROP act creates a right to California residents. To the extent I've read the statute, it doesn't define what entities are covered (see: <https://leginfo.legislature.ca.gov/faces/codes_displayText.x...>), which seems to me to suggest that affected entities are defined by their data collection from California residents, not where or how they engage in activities otherwise in California.
That's my guess