Companies are valued on their potential. Yandex growth was 70% last quarter, Nebius was 454%. Nebius makes deals with Microsoft, Meta, ...
While Yandex could go bankrupt very soon ( 2-3/5 dc's closed, apps not working, robots not working, payments not working, maps show everyting in rivers and oceans, ...).
Nebius is currently going after their best growth driver. Can't blame them.