Disney’s new streaming service, Disney+, has already seen 10 million sign-ups since launching Tuesday, the company announced Wednesday. Disney’s stock was up 7.35% by Wednesday’s close, adding more than $13 billion to its market cap, which now sits at $268 billion. Netflix shares were down 3.1%. Disney’s new streaming service launched Tuesday with some technical errors that prevented some users from connecting with the service. But that didn’t stop customers from flooding the sign-up page. At $6.99 per month or $69.99 per year, Disney+ is significantly cheaper than competitors such as Netflix, which charges $12.99 for its most popular standard...