That's a good question.
I'd say it's because chans are just so damn slow, nobody likes waiting around for some rando to come and answer a thread that got posted three days earlier.
>>Be me
>>Be on some random social media
>>Post a thing, wait five minutes.
>>Six hundred answers!
>>Be me.
>>Be on some random chan.
>>Post something
>>Come back three weeks later.
>>Still no responses