It does not avert Fate, but is the means by which something is extracted from the miser. (Using translation from Muslim 1640b)
عَنِ النَّبِيِّ ﷺ أَنَّهُ نَهَى عَنِ النَّذْرِ وَقَالَ لَا يَرُدُّ مِنَ الْقَدَرِ وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ