All those points - credit, link to the license, and suggested text - are right there, as the very first line of the page that opens on tap. So the difference is if all of that must be directly on a map itself or a link to the attribution, especially when there's little space on the screen, is also in compliance with the license. I've just been thinking that it's in compliance.

That's the legal part. I've been also thinking about all the contributors, and had an impression that the attribution shown after a single tap would be okay for them too.