Recently I added and directly removed a colleague to demo how easy this is.

Stupid, never ever invite somebody into a Workspace who has no business.

The good thing is that the other Owners got an email that this user was added. However, it was not clear by whom and this triggered a lot of questions. 

It would be good that in the confirmation that a person was added to the Workspace, also the person who added this person was added in the confirmation email.

E.g. in the email