There have been other instances in which exit fees, which is what this amounts to, were considered anticompetitive, e.g. [1] (although this was settled so there is no ruling).
Google itself has started to waive egress costs for GCP customers leaving the platform last month, which, according to some sources, is simply a direct consequence of new EU legislation (Data Act) [2], but according to others is in anticipation of wider-reaching EU antitrust investigations [3].
[1]: https://www.agriculturedive.com/news/koch-foods-antitrust-ch...
[2]: https://www.computerweekly.com/news/366566360/Googles-data-e...