YouTube will likely be a weak spot again when Google-parent Alphabet ( GOOGL ) reports fourth-quarter earnings on Thursday, analysts say. YouTube’s slowing ad revenue growth is one issue for Google stock, while the subscription side of its business remains opaque to investors. When Alphabet reported Google earnings for the September quarter, YouTube ad revenues shrank for the first time. YouTube ad revenue slipped 2% to $7.07 billion, missing estimates of $7.5 billion. Google began reporting some YouTube financial metrics separately in the fourth quarter of 2019. For this December quarter, analysts estimate YouTube revenue of $8.2 billion, down nearly 5%. YouTube revenue boomed during the coronavirus emergency, so the company faces tough year-over-year comparisons, according to some Google stock analysts. But other factors also are at work. YouTube "is being squeezed on one side by restrictions on consumer data in the wake of Apple ‘s ( AAPL ) privacy changes and on the other side by increased competition from streaming and short video platforms," said Evelyn Mitchell, analyst at Insider Intelligence, in a preview of Google earnings. Google Stock: Slowing Down TikTok Google aims to slow down the growth of TikTok with its own short video platform. How […]