I'm not sure you can actually know such efforts ever existed there. We both know we're talking about /pol/ here, and one of /pol/'s things is that literally an

I'm not sure you can actually know such efforts ever existed there. We both know we're talking about /pol/ here, and one of /pol/'s things is that literally anyone disagreeing with the extreme hivemind there for any reason is considered a shill. It's to the point where an honest effort at shilling couldn't be differentiated from trolling, as they'd both be received the same way. I'd be much more worried about paid posters on some place like Reddit - it's much more mainstream and has a much more credulous population.