Yes, I think this is the main problem with the idea: it doesn't make sense for someone who already has a job to do a trial job. That's why I think you already

Yes, I think this is the main problem with the idea: it doesn't make sense for someone who already has a job to do a trial job. That's why I think you already do see it with one large category of tech job-seekers where that isn't a problem: students. Tech companies hire student interns for a summer effectively as a trial period, and both sides often like that arrangement.