Tnjed, I am an Adobe employee, and have been so since before we offered Creative Cloud. I don't recall us ever offering a commitment to a fixed price forever. Nancy and Kglad have both done an excellent job of mentioning some of the reasons that prices need to occasionally increase. You can also find an FAQ on this topic at https://adobe.ly/47NZrBr, which might answer a few more of your questions.
I am sorry for any confusion that you have encountered, Tnjed, and I hope you continue to enjoy the services we have to offer. You may want to consider setting a reminder in your calendar to verify we are still meeting your current needs as you prepare for your next annual commitment. ^JW
Thanks, I will continue to use the best - Photoshop.