Absolutely! If you are joining a campaign that pays in Bitcoin, it does not matter for as long as the payment is escrowed by reputable escrow managers here. But if you are joining a campaign that pays you in altcoins, do not take the manager as the best indicator of legitimacy or success. If I know, many of the managers themselves do not do their share of research before accepting any project. They are contented to get honestly paid regardless of whether the project will be successful or not. A personal research is still the best way to determine whether a project is worth participating or not.