FYI, the Factorio devs have stated that the game will never go on sale

Given that neither twitch nor YouTube will let you, you should look at Owncast; but I don’t know about a particular server for that

Meta made a twitter clone when they had the chance, they’ll happily make a YouTube clone.

I don’t think Amazon or Microsoft are very interested in entering that market, but they are the only ones with the money and compute to support such a platform.

Maybe Netflix could be interested? But I doubt it