Because that's how you get a felony criminal case started in Ohio (and most, if not all, states and any federal felony cases).
However, per Wikipedia, "Beginning in late 2025, legal observers documented a marked increase in no-bill decisions in federal cases, particularly in matters arising from protest-related activity."
2 - Trump has propensity to sue or charge anything that moves. "Boy who cried wolf" problem. See also: arresting people for taking peeling paint out of the reflecting pool, even when his own DoJ says it was a botched installation.
However that doesn't explain Ohio doing it as neatly, unless I've missed some local politics there.