Is it though? Facebook and nextdoor are free. That's incredibly hard to compete with.
I'd be interested in building something like this, but even at $100/year, you really can't even afford to advertise for it, so I can't see how one builds distribution.
It sucks that for cash strapped community groups / rescue orgs / etc everyone defaults to facebook, but disrupting that requires a way to make money that isn't advertising, and I can't figure it out :shrug:
A lot of possible alternatives appear to come close, but none really satisfies it.
The area is very ripe for disruption.