In principle, you could use it. The reason for the application you mentions has to do with the number of treated units. The SCM can reach situations where the rest of the methods are not adequate (e.g., a single treated unit). This is often the case of state-level policies vs firm-level events (we usually have many observations and treated units in the latter case).

You can have a look at Cunningham's Causal inferente: the mitxtape (https://mixtape.scunning.com/), which can be of some help here.

All the best,

José-Ignacio

Thank you so much José-Ignacio Antón !

Yes. The synthetic control is widely applied in empirical research in economics and other disciplines. The technique works well. You can also search for tool guides https://economics.mit.edu/files/17847

Article A Guide to Using the Synthetic Control Method to Quantify th...