It's not lack of trust. It's actually a grant of trust - trust that in 6 to 12 months you'll actually start making company more money than you cost them. The larger and older a project, the more time you need to spend learning its specifics before you can contribute something with positive ROI. It's just a fact of life.
The lack of trust is not something I'd be willing to put up with at the timescale you're describing.