It makes total sense to me that this would happen. The economics around Sora and video generation in general are just not there right now, and if you're a company that's also doing research into these things, that's basically a bottomless pit for money. I think OpenAI ceding the space to Google and others for the moment is probably the smart move.
I had fun using Sora and I'm bummed to see it will get removed from the API as well later this year, but no biggie. Veo is plenty good.
It really must cost so much money to generate these videos. That they can generate 12 second videos that are high quality in such a short amount of time - that takes some serious horsepower.