my best source is the sixth (according to Alexa) most popular site on the Internet Probably not. For security reasons, hardly any distros put their names in br

my best source is the sixth (according to Alexa) most popular site on the Internet Probably not. For security reasons, hardly any distros put their names in browser user agent strings these days. Ubuntu might be the only one still doing it. For the other distros, what you're seeing in the stats is mostly old versions from before that shift (IIRC like 2-3 years ago?). This is why the #1 Linux distro (twice as popular as Ubuntu) is "Linux Other". Ubuntu is definitely not 100x as popular as any other distro.