Yet you proved my point by posting a list of bands no one really follows. And bringing up Billboard. Look at the year end hard rock charts for 2020! The top 13, yes, all of the top 13 best selling hard rock and heavy metal albums of 2020 were either compilations or reissues. And then >90% of the rest of the top 100 are, too.I was responding to a guy saying metal bands have no career path, which is just wrong. Lots of bands have "made it" by metal standards after his arbitrary cutoff date. Many have more success than Periphery even without forum presences and fanboy militias.
as far as what's mainstream, you can just look at the Billboard chart. They account for all the modern ways of consuming music (traditional buys, radio play, streaming on most platforms, etc). Metal bands chart all the time. Babymetal's last album is the highest charting Japanese release in Billboard history... made #13 on the main chart.
Billboard.com/charts/year-end/hard-rock-albums