in my opinion, maybe a little guarantee and protect bountyhunter. because if a project uses IEO services, more investors will guarantee the sustainability of the project. so dev can pay for bountyhunter. importantly, project coins will definitely be listing in the near future. Unlike ICO, listing planning is still unclear.
IEO is just one step closer for the success of bounty hunter to be paid but for me it is just like an ICO it is also depends on the team if they will going to pay you back for the effort that participants made.