It's called credit card churning, mainly for signup bonus. Doesn't need much spending. 属于累活。有一定前提。在美国的性价比最高。
-userid2018(夏虫不语冰曲士不论道);
2021-3-26(#13593509@0)
Their experience is the number of opening and closing credit cards would hurt upto 10% of your credit.
-jeffrey815(Smartiecat);
2021-3-26{216}(#13593602@0)
Once you hit that, no matter how many more cards you opened, it does not hurt your credit anymore. Their credit score is still >700 after 183 cards.
We had a lunch and learn on this. Very interesting.