Short answer: not much.
The door chain is a poor substitute for the peephole, intercom, or CCTV. It is also unlikely to deter any trained burglar. Door chains are frequently included with short screws - and a swift kick from a neighborhood teenager should be sufficient. Even using sturdier screws will normally not be successful. The door has to be properly constructed to handle mounting hardware. In addition, doors are usually surrounded by trim pieces on the frame - and those will just tear off.
Door chains do make an affordable child deterrent. So long as the chain isn't mounted sturdy enough to become a fire hazard (check your local regulations), it can be mounted high enough on your door so that young children must make substantially more effort to escape. Enough effort, one would hope, that the noise would attract adult notice.
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