That said, I run old fashioned forums and some older threads get revived there from time to time with new insights. Others get flagged up by copyright holders under DMCA takedown threats or bumped by spambots though.
For example on retro computing boards it makes me so happy when someone bumps a 5 year old thread to share new details, benchmarks, etc. about some card or motherboard where the ancient thread is first thing that appears in search results.