Web 2.0 backlink farms aren’t as effective as they used to be, mainly because Google is much better at detecting patterns and devaluing them. If they’re low-quality or clearly interconnected, they’ll have little to no impact.
Aged Web 2.0s can still work if treated like real sites with unique content, proper structure, and no obvious footprints. Instead of a farm, it’s better to use them as part of a broader strategy and link out naturally. Relying on them alone isn’t sustainable, but as a small supporting layer alongside real links like brand mentioned posts, niche edits, etc., they can still provide some value.