[ok_craig]

Nothing you said is actually a justification for MS's actions.

> Is it legal for Mozilla to distribute Adblock on their site which is a program that disables Youtube and Google ads and hurts content creators?

Yes. This is because AdBlock is a service that modifies the way your own browser - your property - works. It is not in itself a service that pulls YouTube content from YouTube.

For this same reason, it is available even in the Chrome Web Store itself.

I don't understand how you can say "so what" to pointing out that one of these companies is acting illegally, and expect to be taken seriously.

Also I think you meant to say "Google" in your last sentence instead of "Microsoft"? I can't tell and it doesn't seem to make sense otherwise.