This is old news: but there seems to be recent surge of this case.
In summary, Zen Garcia, on his book "Flat Earth As Key To Decrypt The Book Of Enoch” had issued an open challenge to prove earth had curvature or is moving excess of 50 mph: and anyone succeeding would win the contest reward.
William Thompson felt that he had matched the requirements, and Zen Garcia failed to pay him the reward money. And thus the legal case began.
In legal sense, it was really to establish if William's proof has met the requirement to be eligible for the reward.
We will go through part of the legal document; the proof presented by William; and why in my humble opinion, this challenge can never be won in a legal battle.
