VoidZero's business model is in Void, their deployment platform. Open source projects will always stay open source. This was announced at the very beginning.
Nothing changes on VoidZero's commitment to open source. Vite 8 is still set to get Rolldown. I mentioned that also in my talks (e.g. https://youtu.be/fnyK-xXxVKU?t=3027)
Keep in mind that this is a super early preview. It will be source-available when stable.
And it will be free for the community, while companies will have to pay.