Hey Carto_Ferret, those places you pointed are basically raised crossings. The addition of the kerb tag was suggested as an issue fix by the iD editor. If you think about it it makes sense. Before, they were tagged as:

kerb: raised

but missing the initial kerb assignment:

barrier: kerb

This is what iD added. You can see why here https://github.com/openstreetmap/iD/blob/develop/CHANGELOG.md#2018-feb-01 GH issues: https://github.com/openstreetmap/iD/issues/4702 https://github.com/openstreetmap/iD/issues/4715

https://www.openstreetmap.org/node/10703091860 this one does not seem right as this is not where the kerb starts and ends (https://wiki.openstreetmap.org/wiki/Key:kerb#On_a_node), should be on the road. Don't see any policy issues