What a GTM strategy covers
A go-to-market strategy defines who the offering is for, why they should choose it, at what price, through which channels, and with what sales and marketing motion. It converts a product decision into a commercial plan: named segments, a positioning claim someone might disagree with, channel economics, and a capacity plan for whoever has to sell it.
Why it decides launch economics
The GTM assumptions carry the revenue line of the launch case. Channel choice sets the cost of every sale; segment choice sets the win rate; pricing sets what a win is worth. And they interact: the same product can be viable through partners and ruinous through direct sales. Because these assumptions are cheap to state and expensive to test, cases routinely borrow conversion rates, acquisition costs and ramp curves from the best public comparators, then present them as planning figures rather than aspirations. The gap between the two is discovered on the marketing budget, after the build is paid for.