The other problem that I have is there is no easy way (probably for good reason due to potential abuse) to manually trigger Dependabot. So Dependabot might run once a day or not do so for quite a while.
I have found a workaround for this since it appears that Dependabot does reliably trigger when .github/dependabot.yml is updated. One quick hack to insert a commented timestamp later... I now have a way to make sure Dependabot runs when I do want it to.