My approach to what I write on here has never been to check to see what else is on here. This isn't a site that I've ever approached as anything other than a place to do casual writing in my free time.
In the past I would sometimes be inspired to write a Hub after reading someone else's Hub and having a kind of opposing view, but that was in the days when I would go looking for stuff to read on here. I haven't done the "go looking thing" since (even though Google, itself, says it doesn't want people writing for search engines and does want them writing for readers/users) people who once wrote for any readers were pretty much discouraged from writing Hubs that aren't aimed at being found in search.
Whether it's on here on one of my free-time blogs, I pretty much cringe at "weird" type/mix of stuff I've built up over the years. If I hadn't put so much time into writing I'd just delete everything and either start over or not at all.
BUT, some stuff has a shred of one kind of redeeming value, or at least use, or another (for or to me). So, while I'm constantly cringing at my own stuff it's either not time to delete it from view of anyone or else it is my reminder that I make reasonably good use of any free time I have.
Either way, and all that said, I'm an efficient person who condenses my time and efforts down to one main focus, and for my writing purposes here that focus has always been just on writing ("bright idea", dumb idea, weird idea, or whatever else).
I've never been someone who looks around to see what others around me are doing before I do something. It's up to any publishers/publishing site (like the late Associated Content that paid writers up-front for some stuff) to know what's already on the publication/site. HP has never had that. Maybe they now will with the niche sites.
The only place I might look before writing a Hub would be to a "serious" research resource for anything newer than what was out there when I was reading/looking up stuff years ago. I can see how "contamination" would/could happen (which, on the other end of things, could explain the appearance of someone else's Hub/article looking like a search-engine-polished version (for the purpose of competition) of something I wrote.
(There may be something to be said for super-cringe-worthy/hard-to-polish-up) lack of formality/professionalism, maybe? :/ ) (Yes, that is Internet-writing fatigue one may be detecting here.)