Opinion from a long time steward/builder/maintainer: people doing little maintenance things like clearing small branches, fixing small erosion areas, trimming back vegetation, etc. is great and saves us a bunch of time. However, rebuilding a berm is something I'd want to know about if it was happening at a trail I'm overseeing. Sending the steward a note takes seconds and they might have relevant input about that project/feature. I've seen many fixes from people trying to be helpful that end up causing more work for the trail crew. There is a science to trail-building that may not be obvious to the average trail user. Or, the trail crews may have plans to rework the issue/feature completely in which case it would be better to put effort into a different project. Communication is king.
Hard to tell from the photos, but it looks like there isn't enough "meat" to support a tire up high on that berm and it doesn't look well compacted? Rule #1 of dirtwork: don't do it when the soil can't be compacted. If we get a heavy rain that loose dirt will be washed away... The reason I don't build berms with a steep face is because they are a high maintenance item. Local soils will only hold a slope of 30-35 degrees reliably (research "angle of repose" for soils if you want to get into the weeds). Drainage towards the exit of the berm may have also been a factor, but again, hard to tell from photos. Many downhill berms require a drain at the exit and extending them too far will block water from flowing off the trail and create a mud pit.
⚒ Trails don't build themselves. ⚒