1. The recruiter is not contacting him to help him get a job, he's contacting him to provide candidates and get paid if 42floors hires them. It's the other way around.
2. A recruiter never emails you to offer you a job, he's asking you to apply for some position. There's no guarantee you'll get the job. If he's a good recruiter, he studied your profile and knows you're a good match. That's pretty rare. Most of the time, recruiters are just spamming a list of emails addresses of people working in the general field when just a quick look at the linkedin profile would be enough to see that it would be a very bad match.
2. A recruiter never emails you to offer you a job, he's asking you to apply for some position. There's no guarantee you'll get the job. If he's a good recruiter, he studied your profile and knows you're a good match. That's pretty rare. Most of the time, recruiters are just spamming a list of emails addresses of people working in the general field when just a quick look at the linkedin profile would be enough to see that it would be a very bad match.