Looks like StreetComplete has been misleading here. If you answer that the road has no name, then the follow-up question is whether it's a service road, which is easy to mistakenly answer yes to, because it's not apparent that the way is already (validly) tagged pedestrian.

Some earlier talk about this issue: https://github.com/streetcomplete/StreetComplete/issues/159

Anyway, I reverted the changes and added noname=yes to prevent StreetComplete asking the same again.

Thanks for pointing it out.