Why those tags are made strictly linked?
Bondage is related in tying up or actively using certain gear, either for pinup, visual art of for sexual activity. BDSM is relating to certain life style or role-play, involving relation of master and slave\pet or total submission of bottom to top, often associated with semiconsensual, consensual non-consent, or or actively forceful intercourse or other activity, for example sadistic\masochistic session. Bondage may be part of it, but may be NOT.
In addition shibari is visual art which can be used for bondage session or for BDSM, but is own of its kind.
Linking those tags together sometimes produces inaccurate or even wrong results.
Updated by NotMeNotYou