It's the thunderbolt.
In the past, thunderbolts have been used on numerous occasions. The Tampa Bay Lightning are probably the best example.
But when the now-Los Angeles Chargers revealed their new logo, it looked like a hybrid of the Los Angeles Dodgers and Lightning logo, all in one. To no one's surprise, it's drawn a lot of criticism.
Minor-league teams, on the other hand, have nothing to lose. So instead, they decided to join in on the fun.