Agreed.
With Facebook groups / reddit for every topic under the sun and more, it's a nearly impossible task in 2019.
Driving traffic is easy, converting it isn't (on a forum).
Look at this forum, it's taken a years for BHW to convert me as a lurker to a contributor, and still... this site hasn't made a dime from me.
In the grand scheme of things it's got a lot of traffic and paying members etc, brand new forums don't have that luxury.