What is the onus of the problem?

Could you please elaborate on what exactly is meant by the phrase 'onus of the problem'? Are we referring to the responsibility or burden that falls on a particular individual, group, or entity to address or resolve a given issue or challenge within the cryptocurrency and finance sector? Additionally, could you provide some examples of scenarios where the onus of a problem might be placed on specific stakeholders, and how this can impact decision-making and the overall outcome of a situation?