Yeah.

> The likelihood of any legal restriction was probably close to zero - it’s only from today’s era of hyper-regulation that we might even imagine something like that.

Normally I'd agree with a statement like this. Except this is a very specific case.

That lawsuit happened in response to Window 2.0, and the fact that they adopted overlapping windows in 2.0 strongly suggests that Microsoft did not think that the change would lead to legal action and was taken by surprise.