Hi,
not sure what you mean, the point is, the API registration must be done by the webmaster, not you as a user.
In this case it is WU that needs to register (or would need to register) the API and get a key. And you then have a daily limit for free and if you want more you have to pay google some fee. So if for example you had your own webpage, you would need that key. But the error will not fix itself if you as a user register, the code must be inserted in the source code of the page.
WU obviously has lot of views so would probably not be ok with the daily limit (for a regular user it is absolutely sufficient, it is 25000 map loads per day), so rather then paying relatively absurd amount, they decided to dump Google maps... but there really is nothing you as a user can do.