Society will collapse
However you slice it, Society will collapse. We can compare it to the mice utopia. We can spawn food in any form we like, but also fuel. Many bacteria can conceivably be used as such. We don't need to go out to survive anymore. This is where it'll start to collapse.
Our current Society has some failsafe against this. Currently we do have enough food to serve the world several times over. Economics and waste cause a part to still get hungry. The failsafe is all us need to work to get our food on the table and heat in our home, as well as some technological comforts. However, we do see a part of the mice utopia throughout mostly the western world. Although I cannot speak of cannibalism, we do see people getting sexual deviations, only focusing on being pretty, stopping with reproduction or parenting duties and antisocial behaviour. Although this isn't fully because of our abundance, the truth is that we have enough time and resources to expand on these nonstandard behaviours.
With spawning any living creatures by willful thought, you've given us the ability to both sustain and destroy us.
As in the intro, we will have an abundance of resources. Meat from even extinct creatures is available. We can repopulate the world with these creatures and might even bring back little Timmy from the dead. How wonderful.
But what does life matter then? If you can bring Timmy back from the dead, why not two?
I can imagine bringing little Timmy back is a step to far. Maybe you can just get "generic human child" or the like. So how long until hormonal teenagers start spawning naked humans to try to copulate with? Or maybe don't realise the danger of spawning a cool tiger? What will happen with their view of life if you can have animals or humans fight each other to the death, as you can always spawn more?
The abundance will already make us go crazy from the crazy possibilities that let us go far from our normal behaviours that protected us. Abundance and possibilities will kill us.
But what will happen if someone will start something dangerous? All the creatures spawned, or even humans, might get too much. Maybe they think of some nice ebola and other plagues to clean it up. Maybe someone doesn't like someone else and gives out a brain parasite? It takes only a few thoughts before someone thinks of the horrible diseases that are locked up at disease research labs around the world. Flu viruses that are a thousand times more contagious practically always deadly.
After 99% of the world is dead, will we spawn more humans to fill the gap again? Socially, it's just a big ruin.
There's a lot more perspectives to still look at, but in general it's too much abundance and power for people to have.