Anime sub viewers are the minority on Crunchyroll and Netflix, two of the biggest anime streaming platforms, as they both confirm the significance of dubs.
The big streaming platforms probably get pretty much all of the casual watchers, who favour dubs, but have to split the more hardcore fans who favour subs with the high seas. That's going to skew the stats a bit.
And then you have me, who's so hardcore I was forced to sign up for Netflix so I could watch the Dutch dub of Tonari no Totoro . If I was any more hardcore, I'd figure out how to rip it from there, because it's the only home release it ever got, as far as I can tell. Can't even find a second-hand VHS (wouldn't be acceptable quality anyway).
But that whole situation means I'm a Netflix subscriber who "prefers dubs" for their stats, even though I rarely watch a dub.