
European regulators launched investigations against Apple, Google and Meta on Monday.
This is the first case of investigations under the new law - which came into effect this month - which aims to prevent big tech companies from controlling the digital market.
The European Commission said it is investigating these companies for "non-compliance" with the Digital Markets Act (DTA).
The Digital Markets Act is a broad law that targets big tech companies that provide "main platform services" by forcing them to adhere to a series of rules on what they can and can't do.
If they do not comply with the law, they risk severe financial penalties, and even the closure of businesses.
The rules aim to make digital markets "fairer" and "more contestable", breaking down closed technological ecosystems that force customers to use a single company's products or services.
Regulators are investigating whether Google and Apple are fully complying with ATD rules, which require these companies to allow app developers to direct users to offers available outside their app stores.
The European Commission said it is concerned that the two companies are imposing "various restrictions", including payments that prevent apps from promoting free offers.
Google faces criticism that it is not adhering to ATD rules, which prohibit giant companies from favoring their own services over those of rivals.
The commission said it is also investigating Apple to see if it is doing enough to allow iPhone users to easily switch web browsers.
Meanwhile, Meta is investigating an option that allows users to pay a monthly fee for ad-free versions of Facebook and Instagram in order to avoid having their personal data used when targeted with online ads, Radio Free Europe reports.