I’m not clear that this makes Burger King any more ethical, or less unethical. You wouldn’t praise a prolific serial killer for letting the odd victim go. Besides, fast food has a lot to answer for besides animal welfare.
Wouldn’t those same people want to avoid a place like Burger King in general? They’d be supporting the business of one of the largest consumers of beef in the world.
I’ve heard a theory that says the era of small molecules targeting single complexes is probably on the sharply downward slope of an asymptote. If we’re lucky that will just mean new therapies which target complex systems rather than single-drug-targets is in sight. If we’re unlucky there will be a harsh gap between the two eras.