RCS is an international standard. Google only adds their client (and running the service if your mobile provider doesn't).

Don't know what EU apps are you talking about, but yes, mobile apps need Google services. Web interfaces don't.

please tell me ONE app for Android other than Google Messages I can use to send and receive RCS, it surely won't be problem since it's international standard same as SMS, so there must be plenty apps available...

Pretty much all banking apps for Android won't work without Google Play Services, so once again if you are using Lineage or Graphene, you are still stuck with US company to use your European banking services on the phone.

> please tell me ONE app for Android other than Google Messages I can use to send and receive RCS, it surely won't be problem since it's international standard same as SMS, so there must be plenty apps available...

Nice red herring. The number of implementations is irrelevant here, although Wikipedia says Samsung had one too.

Here's the standard, try Ctrl+F "Google": https://www.gsma.com/solutions-and-impact/technologies/netwo...

TLDR there is only Google product if you wanna use RCS on Android phone

nobody cares about standards, if they are pretty much monopolized by one comapny