As fas as know in general version only Managers can be removed by 1 click from all projects on your behalf (Resources → Managers → Remove the user).
Contributors like translators or proofreaders should be removed project-by-project.
I think because of some technical stuff logic is different between those two systems. In Enterprise you create an account for 1 organization, so in case you’ll participate as a translator in 2+ organizations, you’ll create 2 different standalone accounts for each one. In Crowdin you can participate in 10 projects and all of them can have a different owner - it creates complexity for adding the same function.