While it makes for impenetrable forest (scrub? Bush) when mature, you’d have to imagine that the acreage requires to sequester meaningful amounts of carbon would be absolutely vast. Bamboo just isn’t that dense.
My personal experience of having bamboo on my property is that it seems incredibly dense. Bamboo is a actually a grass and has root systems similar to grasses, it grows very close together. here is another resource about the carbon sequestration of bamboo: https://drawdown.org/solutions/bamboo-production
