[ie/bandaichannel] Remove extractor (#13152)

Closes #8829
Authored by: doe1080

yt_dlp/extractor/unsupported.py

@@ -53,6 +53,7 @@ class KnownDRMIE(UnsupportedInfoExtractor):
         r'(?:beta\.)?crunchyroll\.com',
         r'viki\.com',
         r'deezer\.com',
+        r'b-ch\.com',
     )
 
     _TESTS = [{
@@ -168,6 +169,9 @@ class KnownDRMIE(UnsupportedInfoExtractor):
     }, {
         'url': 'http://www.deezer.com/playlist/176747451',
         'only_matching': True,
+    }, {
+        'url': 'https://www.b-ch.com/titles/8203/001',
+        'only_matching': True,
     }]
 
     def _real_extract(self, url):