BRUSSELS, March 17 (Reuters) - Tech giants will likely challenge a new European Union law aimed at reining in their power with the first cases in a potential wave of litigation expected by year-end, one of the EU's top judges said on Friday.
The Digital Markets Act (DMA), which came into force in November, will classify online platforms with more than 45 million users as gatekeepers, among other criteria.
The gatekeepers - companies that control data and platform access - are subject to a list of do's, such as making their messaging services interoperable, and don'ts, including not favouring their products and services on their platforms.
The list of gatekeepers to which the DMA will apply is due to be announced on Sept. 6 and will likely include Alphabet's (GOOGL.O) Google, Meta (META.O), Amazon (AMZN.O), Apple (AAPL.O) and Microsoft (MSFT.O).
Those disagreeing with the label and requirements are likely to take their complaint to the Luxembourg-based General Court within months, its president Marc van der Woude said.