How do I find experts that care about helping a person they have no connection to with a problem for no reward?
There’s lots of easy to access experts on every subject, however, you’re asking for their time for free: that’s a very different proposition.
If you’re happy to pay, just tweet or post on LinkedIn asking for an expert and offer to compensate them fairly, you’ll have offers in no times.
I’d argue the problem is not that the forums are gone, it’s that people aren’t looking to help for free when there’s so many other ways to put value out into the world — better run a podcast about your favourite subject than answer emails about it.