It’s clear you don’t understand the fundamentals of baking. Yeast is a single cell organism.
Yeast metabolism is dependent on osmotic pressure. Osmotic pressure is the pressure that has to be applied for a something to pass through a semipermeable membrane. In the case of yeast, it would be nutrients passing through the cell wall.
There has to be specific and constant osmotic pressure on the cell wall. If there is little pressure, the nutrients will not pass through the cell wall. Too much pressure will force the cell membrane out of the cell wall, killing the yeast.
Too many molecules surrounding the cells can increase that pressure. Salt and sugar are two such molecules. Sugar at 10% begins to inhibit the development of yeast. Sugar at 12% or higher will kill yeast.
Danish has a high sugar content. This is why yeast is useless in danish dough when it is made at home. 10% sugar is the kiss of death. By the time it is around 12% sugar, why would any baker even waste the time to even weigh out the yeast—the yeast is DOA!
Bakeries use a specialized osmotolerant yeast that is resistant to the the osmotic pressure that can handle up to 30% sugar. But you cannot drive down to the Piggly Wiggly to buy it. In fact, I rarely see it at the restaurant supply store.
Bakeries are not in business to waste money and time. That is why they study the chemistry and biology of baking. When yeast is used in a professional danish dough application, it is a very specific strain of yeast is used to ensure it is not killed by the sugar.
You really need to take some basic baking classes.