Mozilla has had their share of mass extension deprecation and breakage.

They moved over to a new extension platform for legitimate development reasons. I agree there was pain but it wasn't a self interested flexing of power to remove ad blocking extensions.

Having what you consider to be a good excuse doesn't mean it didn't happen. Multiple times.

The "excuse" is a distinction between different types of motivating factors and consequences which has everything to do with the relative merits of those two examples.