Yes, that's true. I don't know about other athletes, but even this past 6 months, Isadora needed about US$ 8 thousand monthly for training, but received US$ 5 thousand from the federation and other resources - hence the crowdfunding, which she was trying to reach US$ 5 thousand to get her through the last months. Then Olympics goes by, and there's a huge drop in funding.
For snow sports, the federation has a budget of half a million a year, and for ice sports, a little less than that. So 1. they can't really support a huge number of athletes (and by "support" I mean pay some of the expenses); 2. if you're gonna be a winter athlete, just know that eventually you'll have to put your own money if you want to go to some competitions.