The European Union announced more regulation this week aimed at stiffening rules for U.S. tech giants, but one senior official told the aim is to prevent forced mergers.

On Wednesday, the European Commission named six “gatekeepers” – these are companies with annual revenues over 7.5 billion euros ($8 billion) or 45 million monthly active users within the EU. Amazon, Alphabet, Apple, Microsoft, Meta and ByteDance now have six months to comply with stricter market rules, such as not preventing users from uninstalling pre-installed software or apps.

Thierry Breton, EU’s commissioner for the Internal Market, told Wednesday that a fine of up to 10% of global revenue would be available if these companies do not comply.

A fine of 20% could be imposed if the company continues to violate the rules.

“And if they continue, yes, we have tools, including breaking up these companies, but I won’t want to use them.” “The discussions we have with all these companies are professional, and I think the right decisions are being made,” Breton said.

Apple and Microsoft challenged the EU’s Digital Markets Act’s view that Bing and iMessage must follow the new rules. These companies’ arguments are being investigated by the commission, which will make a decision within five months on the validity of their arguments.

Recently, the European Union has increased its oversight of Big Tech players, and has been criticized for being anti-American since many of these companies are based in the United States.