You still don’t get Trump, do you? That’s alright, neither do Cruz, or the rest of the junior flip kids, who think they can beat him at his level of game.
Once Trump is officially our Pub candidate for President, and enters into the general election campaign, he will get federal campaign money to spend, just as the Dem Prez candidate will get federal money too. Both get funded so Trump won’t have to expend that much of his own money during the general election part of the campaign. Same for the Dem.