LinkedIn vs. Reddit for our launch post

We posted on both platforms:

LinkedIn – 500+ connections (mostly ex-coworkers & industry peers)
Reddit – Nothing, just searched for the subreddits might be interested

Results:
Reddit: 50K post views, 10+ real users, supportive comments & likes. Even a premium user.
LinkedIn: 1K views, 0 comments, only close friends liked, no user conversions.

I even spent 2x more effort on my LinkedIn post. Really expected the opposite...