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(Not a complaint, just offering a data point.)
Last October I got a WF Reflect card with a $20k credit limit. 0% interest until August 2026.
When I have a 0% card, I pay the minimum until the 0% time ends and then I pay it off.
So approaching the credit limit, I asked for a $10k increase. (The amount is probably immaterial to the result).
Was told I'd get a letter in 7-10 days. That same day they generated the denial letter.
Reasons:
Amounts owed on WF credit card too high relative to limit (99%)
Payment too low relative to balance (Minimum 1% of balance)
Amount owed on credit cards high relative to credit limit (one other at 76%, another at 50%. Both 0% interest deals. Overall utilization is 17%)
Perhaps things would have been different if I hadn't waited until I got to 99%. But the card has served its purpose: Interest-free loan from Wells Fargo for more than a year. I'll probably use it occasionally to keep near the limit until the value of 0% falls below the value of a 2% rebate on an awards card...and then to the sock drawer.
I would agree with your hypothesis. They don't have a track record or know that you'll be paying this off in month 11 so maxing out a card then asking for a CLI (despite a BT offer) is enough for WF to tell you no unfortunately