This is a US-centric issue. It exists because American law firms try and maintain a 100% offer rate for their summer trainees - this is to make them more attractive to law students looking for where to intern (yes, this matters to people). These offers are a win-win - firm keeps its 100% offer rate while not actually having to hire the person they don't want, and person gets to leverage the offer for another job elsewhere.

Obviously this is not an issue here because Indian law firms don't have a public offer-acceptance rate. It's only an issue on LI because some bored law student saw a US Instagram feed and decided to post about it here.