Honestly - I don't think it's just the big manufacturers.
If HTML was invented in the current climate, I'm damn well convinced a simple <a href={external domain}> would be shot down for "security" reasons.
We're seeing a real breakdown into walled ecosystems. My opinion is that most of the steps that direction are well-intentioned (Safety, Security, Consistency, etc). The end result is fucking hell, though, where the ecosystem owner profits massively and unfairly compared to all other entities.
