Just tried out nextdoor.com. It tried to load 6 different tracking and marketing scripts that my browser addons blocked. Craigslist has 0. I will not be using nextdoor.
Craigslist may not track your actions, but it doesn't ever update it's UI/UX or add features so there's no reason for Craigslist to collect user behavior data.
Now I completely respect your personal choice, but for others who are more willing to try out something that can provide them real value, I think Nextdoor will win over Craigslist every time.