"Tech companies behind search engines, social networking services, and operating systems with millions of users will face the Digital Market Act’s new rules in the EU soon.

The new rules include several key items:

• They will no longer be able to lock in users in their ecosystem.

• They will no longer be able to decide which apps you need to have pre-installed on your devices; which app store you have to use.

• They will not be able to “self-preference”: exploiting the advantage of being the gatekeeper by treating their own products and services more favorably.

• Their messaging apps will have to interoperate with others."