Yes, I have owned a Prius and Corolla Hybrid and on both vehicles the front rotors always go very rusty because I only ever press the brake down enough to activate the regenerative braking (for better fuel economy). The regenerative braking power of these vehicles is about 20-30kW.

And as a side effect, I haven't needed to replace the brake pads for about 150,000 kms on the Prius. Actually the mechanic told me that they look brand new. I haven't experienced any problems from the rust yet. The front rotor on the Corolla (2020) seems to be a much better, newer design, and doesn't rust nearly as much as the Prius (2014).

endnote. For anyone considering the new Corolla Hybrid ... I rate it very highly as perhaps the best car ever designed.

That’s a bummer to hear, and I saw other folks mentioning that on this thread too. Could you describe the climate in which you’re located? Maybe a humid, salty coastal climate will affect that differently than a dry, dusty climate.