Even with an aged account with karma, posting links too aggressively can still get you flagged or banned on Reddit. The platform is strict about self-promotion and spam detection, so even older accounts need to be careful when posting links.
The best way to avoid bans is to blend in with normal activity first. Before dropping any links, engage in discussions, comment naturally, and gain some recent post history in different subreddits. Reddit looks at both account age and activity to determine whether an account is behaving naturally.
For account age, 3-6 months old with a good amount of real engagement and karma is usually safe, but link posting frequency and subreddit rules matter more. Some subreddits allow links from established users, while others automatically remove or shadowban posts with links.
A safer approach is to post valuable content first, then introduce links naturally rather than spamming them in every comment. If possible, use text-based posts with a CTA (e.g., "I found a good resource on this, message me if you want the link") rather than dropping the link directly.
If you want to scale link posting, using multiple aged accounts, rotating IPs, and spreading out link activity can help avoid detection.