> Shouldn’t we fear they start doing only close source like most us labs once they catch up in market shares ?

IMHO no.

I think it is relatively safe to say that the predominant reason the US labs are closed source is so they can hype up their trillion-dollar valuations on pretty much negative return on capital employed, all propped up by fragile circular financing.

Never say never, of course. But I just don't see it happening any time soon.