I should have been more specific - Frontiers being a predatory journal is more noise than signal. It's useful to have heuristics such as Beall's list, but they

I should have been more specific - Frontiers being a predatory journal is more noise than signal. It's useful to have heuristics such as Beall's list, but they will never capture the subtle (and broken) complexities of academic publishing. In this specific case, in 2022, most researchers agree that the heuristic is misleading. For more information see e.g. https://academia.stackexchange.com/questions/124807/has-a-journal-ever-switched-between-being-a-predatory-journal-and-a-reputable-on https://academia.stackexchange.com/questions/124807/has-a-jo...