Is it really a thing that companies keep such technical choices as a secret to seek advantage? How about even more trivial stuff like using SCRUM (or the secre

Is it really a thing that companies keep such technical choices as a secret to seek advantage? How about even more trivial stuff like using SCRUM (or the secret approach to software development you do). Or "The secret to our success is giving free donuts to all our employees". Do you have other real examples?