It was done in the past for larger US based businesses. I don't see why it couldn't be done with DDG.
Also, if your businesses is under a gag order the most logical thing to do is to act like nothing is happening. Because for DDG privacy IS the product. They don't have better results than Google they are trying to differentiate through privacy (or the appearance of privacy).
The simple fact that iMessage has 0 interoperability makes it much worse than everything else.
So I doubt RCS could be as bad except if they remove the ability to operate with other RCS clients. And even for Google and Samsung that would be extremely stupid.