If you are looking for a free fighting game experience similar to Smash Bros, there are excellent free-to-play options available on the Nintendo Switch eShop and other platforms.
The short answer is no. Nintendo has not released an official free-to-play version of the game. However, there are legitimate ways to minimize costs, look for deals, and explore free alternatives that capture the same chaotic multiplayer energy. Why Super Smash Bros. Ultimate is Not Free super smash bros ultimate play for free