>>9490428In the case of Tokomachi Radio, it's because they keep talking about Ansta and most of their combined audience doesn't seem all that interested in it. They did try to shake it up by inviting guests and then following with a no-Ansta episode, but I guess that was too little too late.
What I do find weird though is that Suisei's covers get more views on her channel than on other people's channels. While it's only natural her bigger subcount draws bigger crowds, she has all her covers on a playlist on her front page, which you'd think made people check all the new covers, not just the ones on her channel. Not about duets either, since Tokomachi covers in particular do better on her channel than Toko's.