Depp had been pretty adamant that he did nothing and people believed it. Amber has been the one most vilified publicly over the past months for whatever happened. So I think this decision was a surprise to many folks who really just thought Depp had done nothing (as he has said many times). It ends up being a really bad look now, because it looks like he was lying about being abusive.
It is a real shame. I'll miss him in this role, as he was just so perfect as a villain. But honestly the franchise is kind of a schitzo train wreck in some ways anyhow.