When I build a tree, I might find somebody who "married one of these 3-4 chaps, no idea which one ... so I'll add them and follow the lines down, to see if anything ever makes sense..." because there's no other way to do it and remember what you found... iyswim. If I find somebody who isn't right, I'll leave them on the tree and I change their surname to include the suffix _DUD - and my notes say why I discounted them.... so I know, in case I stumble across that potential connection again in 10 years' time as it'd save me wasting time.
I guess the issue here might be that: she has no idea others might see what she's working on .... or that anybody might take it as "true".
People will use the framework as fits their purposes... and not how ANC intended it to be used, or how others use it. Some might be meticulously ONLY be adding "true/proven/must be" people ... others "toss all and sundry at the tree to see what sticks", using it as their "rough notes and finished stuff" ... all their ideas and notes in one online spot for them to use/discard over time.
I think that is a very good point. I may look for connections in other people's trees sometimes, but I'm not judgemental about what I find there.
I also think that there are probably a lot of people out there who are not very experienced with computers. Once they have added something they may not know how to remove it, and before long they have produced a tangled web which they don't know how to amend.