You’re correct about the share to the max but no, the “no follow ugc” doesn’t go away after original hyperlink is shared. Domain name, content, etc. really become less web propagating but yes, must be max shared for your own search engine bot crawl, then the shared URL link, content, etc. are web propagated. More of sharing but from only the source, web propagation/spread happens, unlike when shared from many other sources of the same shared link, content etc., the more spread.