I also modified yt_dlp. But I do not remember what I changed. Have fun

yt_dlp/extractor/commonmistakes.py

@@ -0,0 +1,42 @@
+from .common import InfoExtractor
+from ..utils import ExtractorError
+
+
+class CommonMistakesIE(InfoExtractor):
+    IE_DESC = False  # Do not list
+    _VALID_URL = r'(?:url|URL|yt-dlp)$'
+
+    _TESTS = [{
+        'url': 'url',
+        'only_matching': True,
+    }, {
+        'url': 'URL',
+        'only_matching': True,
+    }]
+
+    def _real_extract(self, url):
+        msg = (
+            'You\'ve asked yt-dlp to download the URL "%s". '
+            'That doesn\'t make any sense. '
+            'Simply remove the parameter in your command or configuration.'
+        ) % url
+        if not self.get_param('verbose'):
+            msg += ' Add -v to the command line to see what arguments and configuration yt-dlp has'
+        raise ExtractorError(msg, expected=True)
+
+
+class UnicodeBOMIE(InfoExtractor):
+    IE_DESC = False
+    _VALID_URL = r'(?P<bom>\ufeff)(?P<id>.*)$'
+
+    _TESTS = [{
+        'url': '\ufeffhttp://www.youtube.com/watch?v=BaW_jenozKc',
+        'only_matching': True,
+    }]
+
+    def _real_extract(self, url):
+        real_url = self._match_id(url)
+        self.report_warning(
+            'Your URL starts with a Byte Order Mark (BOM). '
+            'Removing the BOM and looking for "%s" ...' % real_url)
+        return self.url_result(real_url)