The initial reaction is "why on earth would I give Facebook MORE of my data, no way" but as some commenters said, this would be a great tool to use to see if it can automate some of the tools that I have not been able to automate (e.g. Facebook most of all!)
If it will help me search (or rather "comb") through rental posts on the trillions Facebook groups (that Facebook spent years making in unsearchable sanely) I have to subscribe to (just for my city) and make it even 10% better for me, I might as well pay a bit for this tool. Why? Because I like it or hate it - that's where the rental posts live (and very little elsewhere - and even those are on Facebook).