ServiceClass is called even If the service name is not in the URL

I have created an api service (see below) and I am wondering why the MyServiceClass.__call__(...) is called even if the request doesn't contains @my_service_class as e.g.:

curl \
    -s \
    -X GET http://192.168.45.133:8080/Plone \
    -H "Accept: application/json" \
    --user admin:***
<configure
  xmlns="http://namespaces.zope.org/zope"
  xmlns:plone="http://namespaces.plone.org/plone">
  <adapter factory=".get.MyServiceClass"
    name="my_service_class"
  />
  <plone:service
    method="GET"
    for="zope.interface.Interface"
    factory=".get.MyServiceClassGet"
    name="@my_service_class"
    permission="zope2.View"
  />
</configure>
# -*- coding: utf-8 -*-
from plone import api
from plone.restapi.interfaces import IExpandableElement
from plone.restapi.services import Service
from zope.component import adapter
from zope.interface import implementer, Interface
import pprint

@implementer(IExpandableElement)
@adapter(Interface, Interface)
class MyServiceClass(object):
    def __init__(self, context, request):
        self.context = context.aq_explicit
        self.request = request
    def __call__(self, expand=False):
        print("self.request", self.request) # <- this is called
        return {}

class MyServiceClassGet(Service):
    def reply(self):
        service_factory = MyServiceClass(self.context, self.request)
        return service_factory(expand=True)['my_service_class']

It is a feature. See https://github.com/plone/plone.restapi/issues/1328#issuecomment-1043329664

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