Sometimes it seems worms just like to do their own thing too. Jane at Rockingworms did a video on "worm group think theory" where the worms were going to thr edges of the bins for no obvious reason I.e conditions seemed great. I run outdoor nightcrawler bins and they seem to want to escape WAY more than red wigglers do, despite the same conditions inside the bins. Often it can happen when it's due to rain/storm, or when it has rained the worms look to follow the moisture. My bins are covered with a tarp but they still seem to climb over the tarp. Basically lesson of the story is for worms like European nightcrawlers, or even red wigglers, sometimes they'll just do strange behaviour despite our best efforts. But optimising conditions definitely makes a huge risk reduction in escapeeism so is 100% worth doing