The same thing was happening to me...always the pop up when I hit “recent posts” and only on scubaboard. I believe the malware targets frequently refreshed pages.
I’m not sure which of these fixed it, but this sequence did stop the pop ups.
1) Put Ipad in airplane mode.
2) clear cookies and cache in Safari (Settings/Safari/clear history and website data
3) Out of airplane mode
3) Install IOS update
4) open safari (whoops, one of the ad pages was still there)
5) close safari
6) back into airplane mode
7) clear history and website data
8) Now no pop ups (knock on wood)
I’m not sure which of these fixed it, but this sequence did stop the pop ups.
1) Put Ipad in airplane mode.
2) clear cookies and cache in Safari (Settings/Safari/clear history and website data
3) Out of airplane mode
3) Install IOS update
4) open safari (whoops, one of the ad pages was still there)
5) close safari
6) back into airplane mode
7) clear history and website data
8) Now no pop ups (knock on wood)