The reason Wayland users might be more likely to opt into telemetry is because they see Wayland as "developing" and therefore needing that user data for development purposes. I have no idea what the incidence would actually be, but there is certainly a potential selection bias in there.
Nothing solid. It would be entertaining if it were the opposite. But unless we have a really good reason to think we know which way it leans, the unknown unknown means I wouldn't want to trust the numbers.