There really are very few ruby/rails jobs/contracts going at the moment.
But ominous because in the bigger picture, perhaps the next step after working for free, will be that you have to pay to indulge your passion on real projects. Like many other hobbies I guess.
No, you're doing 5 hours free so you can get people into the start of your sales funnel, after which you'll attempt to sell them the paid service. Even if it may be a good worthwhile service, the dishonesty is a hard stop for me and many others.
Just say it's like a free trial and if people want even more out of it, there's a paid version with more hours/features. Just be honest man.
Well, for starters because 5 hours/month amounts to almost nothing in any non trivial project.
I am not saying this is dishonesty or a scam, I think it is a legitimate way of marketing your services. But I would be the fool if I thought that there would be no followup.