At the same time, they made a lot of people angry. They could as well protest right after the last racer crossed the finish line.The point of a protest is to disrupt and bring attention to a cause, so in that sense the climate activists succeeded.
From Wiki: "In the same month [May 2023], in Vienna, an emergency patient died in congestion caused by the group. A speaker of the group stated that it had made the mistake of not informing the ambulance service centre." Climate change is a very important issue, and there is nothing wrong with bringing it to public's attention, but there are better and smarter ways of doing it.