The primary disincentive against attribution/linking is copyright, e.g. if you make it easy to find the source you make it easy for DMCA takedown bots to snipe at the culturally generous hosts.
A lack of copyright (through abolition or copyleft) restores people's natural inclination to show respect, and to demonstrate the pedigree and provenance of their sources.
Of course, one can go to the other extreme like Creative Commons and effectively threaten to sue people for millions of dollars if they fail to attribute their source.
Nature has it best. People will show respect where they choose, and where doing so does them and those they respect credit, not avoiding it or doing it because of legal cost or threat.