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Back when I did it the biggest site for CC churning and Manufactured spending discussion was FlyerTalk. I believe Nerdwallet spawned directly from that community. There were a variety of smaller private communities as well.
When you open these cards, after searching for and finding suitable deals there are often big caveats for the "free points" or cash back, such $5k spend in the first 3 months. This country's banks are known for their predatory lending practices and will often give you a fairly substantial credit limit. If you aren't careful and do this multiple times a year you will affect both your average credit age and get into available credit lines the bureaus assess as risk. This can tank your score if you aren't careful. You need to know to manually lower the available credit on these cards and which cards to cancel and on what time frame.
If you are actively doing this you start to realize the time spent on the activity is far more worthwhile spent on learning or doing something useful, like your career.
Average credit age's effect on the score is minimal unless you are just starting out or are lol/24 and churning crazy numbers of cards per year. My average account age is around 4 years (8 new accounts in the past 2 years), and I have a score in the 820s (and a high household income.) There is no point in "manually lowering the available credit" on your cards until you are so late in the game that Chase/the other lenders don't want to extend you additional credit, and you don't lower your credit limit, you reallocate it between accounts, because total available credit is a positive effect on the score.
I don't think anyone here is advocating turning churning into a full-time job (or getting deep into the hobby without doing due diligence), but if you want to use it for "pocket money" on hobbies so that you can sock away even more money in investments, who cares? The "predatory lending" argument applies to prudent credit card behavior in general - use like cash, don't spend beyond your means, churning or not.
And to be clear, I would never spend a grand on one of these cards, either.
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