Boarding FlixTrain late? Penalty for doing so?

According to the terms and conditions, this isn't possible, which makes no sense to me (except for FlixTrain's profit-seeking perspective), and I don't see the point in canceling and now booking for €40 more, even though I'm just boarding a bit later, because it makes more sense to me than driving four hours to Bremen…

Flixbus?

Evening friends, I have a question about the Flixbus app regarding two things that are confusing me and leaving me confused. If, for example, a trip says "only 4 seats left," should we believe that this is actually true, or could it just be Flixbus's marketing to sell more tickets faster? And secondly, if nothing…