It was a matter of time. The pop-ups were a sign of the apocalypse. It is sad to see Topozone go.
There is a void now that trails.com probably can't and won't fill. My limited dealings with them has been a headache. I do not like their nickel and dime approach to everything.
All map sites seem to be trending to 'premium' services. It's a shame since the basic images of the maps is often all I really want. For me, I have the Arizona State University map library nearby which has topos for all the USA. Even so, I will miss topozone. It remains to be seen what will fill the void - if another company will find some happy middle between the topozone 'free' site and the trails.com 'arm-and-leg' site. We don't need all the bells and whistles all the time.
I have no issue with paying for maps. But I need more convincing before I send 50 bucks to trails.com especially in view of my past experience with them.