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.
Yes, nothing different from any other VC dev tool startup. When the community fractures people simply move on to something else. See rome -> biome for a very recent example.
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.