@christianp Looking at the issue tracker for @streetcomplete it seems to be quite a hard problem to solve. OSM doesn't want anonymous edits, and almost regardless of how you randomize or shuffle your data, it's going to be relatively easy to reconstruct your movements and who you are. It's simply a fact of the matter from recording and posting that sort of positional data.
So the short answer seems to be "no" unfortunately. Chedk out this issue for some more discussion: https://github.com/streetcomplete/StreetComplete/issues/3507