if you would understand "risk free" you wouldnt ask this.... Nothing in the world is risk free except 1 btc = 1 btc . Everything else includes risk.

You think bonds will stay that high? for how long? what gurantee you get that there will be no default? What gurantee that there is no war? what gurantee there is that they are not converted to war bonds? ....

risk free means just "you are blinded to see the risk behind, because you/yourself will be the yield on the product"