Not dead, but not so busy. I don’t know the exact number.
Iirc there are still pony conventions in America, parts of Europe, China, and Russia. The one in Russia was infamous for being stopped by the authorities over allegations of “LGBT propaganda”, as Russia is waging war against another country.
iirc bronycon attendence was much higher in 2013 than 2015. Just because there were more cons at a certain time doesn’t say shit about attendance of each. Using cons sure isn’t the best measurement if it stands alone.
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