Yes, that is required in the United States for SMS messages. It's unfortunate, in my opinion, that everyone who wants to use SMS gets forced into signing up for a campaign even if they aren't doing a campaign of any kind. I believe this is government overreach. Hoping that regulations like this are dropped at least for non-campaign SMS.
For this reason, I plan to expand the Messages feature beyond SMS and add other messaging options. I'm interested in bypassing the PSTN since it is being ruined by excessive regulations.