From my understand (degree form YouTube), our understanding of what is needed for life is liquid water and free energy.
Which means earth like is most likely, but there are other alternatives. For example, the moon of Jupiter (Titan iirc) is ice covered but has liquid water beneath the surface, and the gravity of Jupiter should provide the free energy so that’s the Vegas favourite for finding extraterrestrial life within our solar system.
As I understood it back in the old times…. The Flat Earth Society was a groups of logical rationalist who got together and for shits and giggles (as well as practicing rational debate) would pick an indefensible argument (eg. the earth is flat) and attempt to use rational arguments to support that indefensible claim.
Basically a rowdy drunk philosophers get together.
Edit: there is no proof of this, just something I read online in the early days of the internet.