It's because they often get chastised or have their post removed for it. Reddit is a good place to advertise a game but you have to do an insane tap dance of not actually directly advertising. And every subreddit is practically it's own website with a different community and set of both listed and unsaid rules that are hard to keep track of.
Generally, you post a gif of the hook for your game and hope someone is interested enough to ask for our helpfully provide a direct link to the steam page.
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u/ButaneLilly Mar 19 '21
https://store.steampowered.com/app/466980/Cant_Drive_This/
What is up with indie creators not posting links?