Large portions of the film appeared on YouTube Wednesday.

Significant segments of Spider-Man: No Way Home were leaked online Wednesday morning, and Sony worked as quickly as possible to snuff them out.
Large sections of the highly anticipated film began popping up on YouTube via innocuous Spider-Man searches; the algorithm naturally then suggested similar pirated footage.
The leaks are reportedly significant, legitimate spoilers. One such leaked segment was nearly 10 minutes of the film. A lion’s share of the leaks had foreign subtitles while some had a foreign dub. The quality ranged from super grainy to quite clear.
Sony worked diligently to get the leaks booted off the platform. Within minutes of the initial postings, several of the leaks were down and slapped with the message: “Video Unavailable. This video contains content from Sony Pictures Movies & Shows, who has blocked it in your country on copyright grounds.”