Because Plugshare is closed source, locked down and a bizarre cesspool of uncurated garbage with zealously curated but misleading or straight up wrong information.
For example, in Australia, the largest supercharger networks are Tesla and Evie. For reasons I won't even pretend to understand, Plugshare refuses to allow either name in their labels, so if a town has both, they're called "Town (1)" and "Town (2)" at random. Not only does this make searching a pain, but people just select whichever pin happens to be on top and then submit their charging reports for the wrong charger. Gar! Typical example:
Weird, this problem doesn't exist in Europe. I found Plugshare to be more reliable and informative than ABRP, especially in the areas where charger stations aren't that common.
Being truly open is a huge plus for OCM. Checking a few locations in both I found that PlugShare had locations properly listed as under maintenance while OCM listed them as open, so at least near me the Plugshare data seems more accurate.
I also really appreciate the images and comments people have posted in Plugshare to help find out of the way stations or stations that might not be reliable. If OSM took off it would get there, but none of the stations I checked had any comments or images.
I'm not a big fan of the OCM station formatting. There's a bunch of useless information above the fold and a bunch of useful information below the fold.
OCM doesn't appear to have any pricing information while PlugShare at least tells me if the station has a charge and if the parking itself has a charge.
I hope that open services like this can get station data from more direct sources for more accurate information, but the data isn't quite there yet for me to want to use it when I'm actively looking for a station.
This was my immediate question. Looking at this data in my city it reports a bunch of chargers that are either 100% gone or have been broken for a year. PlugShare reports those all correctly. I'd have a pretty bad time trying to charge around here (metro population of 2.5 million) if I relied on this dataset.
In London (UK), OCM seems to have more chargers and more accurate data than PlugShare. Zap Map is probably the best option though, but even them are missing some slow chargers.
For example, in Australia, the largest supercharger networks are Tesla and Evie. For reasons I won't even pretend to understand, Plugshare refuses to allow either name in their labels, so if a town has both, they're called "Town (1)" and "Town (2)" at random. Not only does this make searching a pain, but people just select whichever pin happens to be on top and then submit their charging reports for the wrong charger. Gar! Typical example:
"Oliver's Gundagai (1)" https://www.plugshare.com/location/205861 (Chargefox)
"Oliver's Gundagai (2)" https://www.plugshare.com/location/76887 (Tesla)