Does watching a YouTube clip that contains music and has one million views make the sins of the previous viewers count against the new viewer, or do his sins begin after the one million mark?

The questioner is warned against watching the aforementioned video if it contains forbidden content, and watching it incurs sin upon him alone, as Allah says: "And every soul earns not [sin] except against itself, and no bearer of burdens will bear the burden of another." He is also not sinful for someone else watching the video after him, unless his watching of it promotes it.