> Someone willing to extract CO2 from the air and store it in some rock forever can indeed offset some carbon you emitted.

This isn't what carbon offsets typically are though.

More like this: I promise not to slash and burn this forest if you give me $1000. There, you've now removed however many CO2 from being emitted, meanwhile I sell the forest to someone else who either makes the same deal with some other guy or just cuts it down because whatever they aren't under any obligations to not slash and burn the forest.