How is that different from, say, being forced to buy a PS5 or an X-whatever to participate in a gaming community, or to get a Spotify membership to hear a particular podcast?
With each of these products we keep giving up more and more of the powerful variety that was available before. While the average person doesn't lose much, the average person doesn't really exist and we've really lost a lot of long tails of value.
Is there a moral principle preventing a power company from providing you with all your electrical appliances and forbidding you from using those not provided by them?