They (credit card) make the rulesTo play from. If you can play it to your advantage a small bit then IRS is ok with it. If you make it your full time job to play the rules then apparently it’s income. So what value of rewards is the threshold for the IRS ? 2k, 10K, 100K. We know now that 300+K is over the limit into income.
The title is misleading. It wasn’t so much the “rewards” that were taxable but the fact that he was able to churn his cash and earn say 4% or so in cash using the rewards.