Yes, we do. And we anonymise the account. We do not delete it. We change the names to “Deleted account”, change the email to “deleted-{random number}@deleted.com”. We also remove, gender, birthday, country, avatar, nickname, any interests the user might have declared. We remove the user from the lists of “Following” and “Followers” of other users.
We do all this because of the same reason mentioned in other articles. Deleting the user itself will result in change of rankings.