When I started researching my family history, I had my tree on Genes, and incautiously opened it to someone who may possibly be related to me - we haven't proved it yet.
I am absolutely fine with sharing all my research with anyone who is connected to me - indeed I go out looking to find them! - but when I call this person a "name gatherer" I mean that he put on his tree absolutely all my details, all living family members, including my partner's family which is not connected in any way to him. And what interest can it be to him, in any case?
So I left my very inaccurate tree on Genes, don't release it to anyone, and started my research on Ancestry. Recently I saved my Ancestry tree and uploaded it on Genes and have now an explosion of new hot matches, some of which are really interesting - and people are evidently very surprised to have me pop up in their own matches with a lot of relevant names.
But I do think it depends how serious you are. I try to have all my research backed up with census and birth refs, but I am constantly finding inaccurate stuff I put on in my enthusiasm some years back (I had the embarrassing discovery that a name on my tree - a Genes hot match - seems totally unrelated to anyone, I can't find how it links in at all

although it must have done at some point) and am now thinking I need a very organised edit of the tree.
But there is always so much to do on the tree, whether it's entering all the details from the census like precise address and occupation, and tripping over names on the same page which relate to the family, or looking up the history of the time, or speculating exactly how two of the ancestors met and married......
Let alone the ambition which is I am sure shared by many others that I will, one day, put it all down in a book. For the family, of course.
