It sounds like a conspiracy but many who have been to South America report early streamer emitters on mountains to protect entire villages in the tropics. A well grounded summit cross does the same thing, of course, but the effect can be intensified with targeted current discharges.
We know from high-voltage line corrosion research that thunderstorms can release enormous amounts of hydroxyl, so these lightning protection devices tend not to be for residential properties. Here is the description from ABB and yes, these emitters are not really available in regular shops, since much more efficient and cheaper lightning protection is more for the global south.
OPR terminals with early streamer emission (ESE) are particularly effective for lightning protection of industrial sites, administrative or public buildings, monuments and open spaces such as sports fields. During a storm, when propagation conditions in the field are favorable, an OPR-ESE flight terminal creates an upward precursor. This leader pointing upwards from the OPR peak propagates from the cloud towards the leader pointing downwards at an average speed of 1 m/µs. This emission from an early streamer on a lightning event offers an advantageous trigger time compared to a single-stick flight terminal exposed to the same conditions. The favorable tripping time is determined as the average gain in time at the moment of spark flashover, with efficiency confirmed by high voltage laboratory tests. All ESE tests are defined in Annex C of French standard NF C 17-102 (2011 version).
Another advantage that ESE lightning protection could offer would be the generation of CO2 certificates through the oxidation of methane. 
