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Last year I opened OpenSky. I have the same massage like you but not any increase.. I will close this acc next month or in October. I neve use it, just paid anual fee.
I have an OpenSky card as well. Woke up this morning to check my email and I received an email stating that due to my excellent payment history they've decided to give me a $100 credit limit increase, no deposit required. Checked my account and this was true. I have never heard of this either, but they must be stepping up their game. Congrats! Seems like you and I aren't the only one. I've seen a review somewhere and someone also got the same email.