Yes it does since the quality of brain moving into IITs is really above average who undoubtedly deserve great placements rather the companies offering them should be obliged if their offers are accepted.
Yes, they have done it in the past for many candidates and they are doing it in present for candidates who are enrolled with them and let's be hopeful for future too...
but still it is come under consideration that faculty of iit is not as intelligent as its students.will it not have a worse effect on the students in the future.