I work in adtech and hear "We don't want to track people, we just want to know what events led to conversion" all the damn time. (Or conversely, from the sell side, "we don't want to track people, we just want to learn/verify our audience's composition.).

Sorry to break it to you, but that's what tracking is.

You're saying you don't want remarking, but - you want to know something that requires marking. "Remarking" is just persistent marking. What you don't want is "retargeting", which is when the user gets to learn someone is building a profile of them. But that's just whether the "marked" profile is used to also "target" - the profile gets built either way.