Nah. Ubuntu is used a lot on servers, in virtual machines and in containers. There's also a good number of companies that hand out Ubuntu to their employees as workstations or ship it to customers preinstalled on devices.

Mint might have more users in the hobbyist+desktop space, but personally, I don't believe that either. Ubuntu is much more widely known, so even though Mint sees more recommendations in forums like Lemmy, there's gonna be tons of users who just install the distro they've heard of before, or which their friend is already using.