Otherwise, I wouldn't call those things front running, as there's no indication of imminent activity.

If a material increase in lending rates on a heavily shorted stock was announced, and you bought because you were pretty sure the shorts would be buying to close, that could be front running, yeah.

I dunno about market moves based on Elon's role in the culture wars, but maybe if he did something in particular.

In general, buy on the rumor, sell on the news could qualify as front running under this definition, but I think I'd want to narrow it a bit to working to trade ahead of perceived imminent and definite trades. Most of the illegal front running is trading ahead of specific trades in response to seeing those orders.