I believe there should be a broader family of terms besides rug pull for when the intentions of vendors and developers change over time to become extractive and negative. No, enshittification is not the right word.
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The FOSS license is the bait, and the CLA is evidence that they had ill intent from the start
The concern is if they stop dual-licensing, and future releases don't come under a free license, but they only work on their proprietary relicensed version. You have the option to fork, under the same free license that it was originally under - you just won't get further updates from the company involved. I don't see the problem here: You aren't entitled to those updates just because you made some contributions.