This is not new, a lot have been said too - https://lists.openstreetmap.org/pipermail/talk/2021-April/086458.html
Yes, several ##hashtags for Changest comments is very bad and not helping human.
Looking around Ghana and seeing especially new mappers whose first point of contact to OpenStreetMap is via some kind HOTOSM Tasking Manager instance activity / project, carry on this hashtag way of changeset comments to their individual contributions IMHO is not a good sign of building a good project, community and future.
It could be that some of them are not aware of it or think it’s cool to use ONLY hashtags as a changeset comment. Please, if you don’t know, It doesn’t tell anything useful.
This is why I now leave comments on such changesets in Ghana to draw mappers attention, I hope this little efforts convinces someone.
I recommend you read: https://wiki.openstreetmap.org/wiki/Good_changeset_comments and always use a descriptive text that can help yourself and everyone tell what actually happened in a changeset in the future.
If you are a trainer, catch them young!