Who can use the Bifrost?

Could you elaborate on who specifically can utilize the Bifrost? Is it a service reserved for a select few or is it accessible to a wider audience? Are there any prerequisites, such as specific qualifications or ownership of certain assets, that must be met before an individual or entity can gain access to the Bifrost? Additionally, are there any limitations or restrictions on who can use it, or are there different levels of access based on certain criteria? Clarifying these details would help us better understand the scope and accessibility of the Bifrost.