Christo, my guess would be that if it does not request API keys from an
end-user, then it must be using a single API key either hard-coded into
the add-on, or working via developer's website, also using pre-loaded
API keys, so maybe it's just then overloading requests against that API key?
From the add-on store's info for that add-on - I trimmed the end of the
mail address, but it's complete if you review it via add-on store:
for any requests or suggestions, contact me at sujanrai844...
Jacob Kruger
"Resistance is futile...acceptance is versatile..."