Mulberry, Commercially Growing?

So I'm looking into if mulberry has good potential for a wine, or products like jams, jellies, or juice.

Also if it can be grown on espalier.

I've read it take a ton of trimming, so thus wasn't grown commercially.

Other people will have better input on your direct question above but I would add:
mullbery leaf sold as a dried tea in bulk form or bagged form is a high value yield you can derive from pruning. It is highly esteemed in chinese medicine but its also just a very tasty herbal tea. If you were to pursue growing large amounts of mullbery, this would provide a secondary yield.

Muberries contain low sugar, therefore making alcohol directly from them would produce a low alcohol product akin to hard cider, unless sugar were added.

They ripen over an extended period, instead of one ripening date common to other fruit trees. The trees produce lots of small berries prolifically. Shaking the trees onto a tarp might work for harvesting berries for jams, or wine. Hand harvesting for farmer's market would yield a good wage.