As I mentioned, I work primarily with my online tree. My primary online tree is private, after too many encounters with those who copy everything with a similar name, without caring whether s/he belongs in that family. Another story for another time.
But - what I do, now - I sync to my FTM, then upload as a different tree, public, without any media, only source info. I do that for the benefit of those who need the information on my core families.
Long story to say that I have noticed some cross-linking of records, on the uploaded tree, primarily on the 1900 census. The 1900 US census record for Bob Smith is regularly linked to his wife, Mary Jones Smith. I have not noticed it with records other than the 1900 US census.