But the whole point is to remove CO2 from the atmosphere. These just put it back in again.

Yes you're right. One could argue though that those usages would avoid dirty sources of CO2.

But I agree that "avoiding to output more CO2" is not a replacement for "removing CO2", and this is very important indeed. It's just an additional war front, not a replacement.

A counter top Sodastream that pulled CO2 out of the air would be novel!.

Each burp would feel guilty though lol ^^;

Thank you so much for this!