The MKV format is preferred for "extra quality" because it can bundle multiple high-quality audio tracks (like FLAC), subtitles (ASS/SSA), and high-resolution video into a single file.
MKVCinemas streaming piracy service with 142M visits shuts down searching for mkvcinemas in extra quality
While the monetary cost is zero, the user pays with time and safety. These sites are typically funded by aggressive advertising. Pop-ups, redirects, and fake download buttons are standard. In the search for a high-definition movie, a user is often bombarded with potential malware or phishing attempts. The MKV format is preferred for "extra quality"
The first hurdle in finding extra quality content on MKVCinemas is not the content itself, but finding the legitimate website. but finding the legitimate website.