The actual price increases are listed here[0].
For example, currently a .com domain can be renewed for $17.75/year (tax inclusive - I personally renewed a .com domain for the maximum of 4 years tonight). After the increase this will be $23.99/year (26% increase).
I've been a long time (sometime prior to 2007) Gandi customer and ignored previous discussion concerns[1], but this will be the last time I renew my domains with Gandi. The v4->v5 user interface change was painful at first, but they have fixed most of those UX issues - at least as far as the DNS support, which is all I really use. But their service is definitely not worth the premium.
[0] https://www.gandi.net/static/documents/2023-july-usd-renew-p...