If the answer is yes, does that mean a junior web dev who implements user tracking on a shopping portal is equivalent to Hitler? Or is every who does less evil than Hitler "not a bad person"?

I don't think it's useful to say "Hitler was bad." Hitler did a lot of specific evil acts that are more useful to analyze. If anything, it's counterproductive to say "Hitler was bad," because lots of people do bad things and then say "well, at least I'm not Hitler."