Well, that is basically true.
Participating in the campaigns handled by popular campaign managers is just another thing we should look for.
BM's are indeed being paid to manage a certain campaign, but for those popular ones, they are not just accepting projects to be paid, they are still investigating the project they handled to avoid ruining their reputation.
To reduce the risk of being scammed, besides joining a campaign managed by a well-known manager, you can also choose projects that use the concept of their bounty campaign escrow tokens, funds must be handled by the campaign manager for the convenience of both parties.
Yes, and apart from doing at least some research on the project you want to promote, although choosing a manager is also one of the reasons to avoid a fraud project, at least do a lot of preparation.