I can't remember the last time I was able to dive somewhere without providing some sort of medical statement...sometimes oral, sometimes check a box that I have no problems they should be aware of, sometimes a copy of the RSTC form, sometimes their own form. Their dive operation, their rules. I don't mind it so long as I know in advance.
A few years ago we had a group arrive at a dive boat in the Maldives and when we boarded they handed us an RSTC form and said fill it out and sign it. We huddled as a group, talked it over, and we all handed in total lies....No to everything, no signature by a Doctor needed by anyone. We had no alternative. After the trip, the outfit marketing that boat got an uncensored piece of my mind...and that boat is no longer one of their fleet.