CONCLUSION
Establishing a strong and firm business doesn't come easy. It involves patient, time, passion and hardworking. Young entrepreneurs should try to learn from failed businesses and guide themselves with successful businesses.
To this you are right, but more than learning from failed businesses and enterprises, Aspiring entrepreneurs should take a page out of the book of successful projects and businesses, their trade secrets, behaviors and practices that they are actively using and abusing to ensure success. It also must be noted that it's not enough that you are industrious, you must also be intelligent and wise in making decisions especially ones that will affect the scalability of your project.
Maybe we can not say failed, because until now it is still running. Like OLX. OLX is still officially trading goods, both new and used. We can sell goods by meeting directly with buyers. However these companies operate independently in each country. Although in one country it is no longer used, in other countries it runs smoothly. I think it depends on the competition within a country.
True, OLX is pretty much still up and running although the company is as far as I know already absorbed by a much larger project that dabbles in the same sector OLX used to be in. They also underwent a bit of a rebranding if I'm not mistaken. Although when summed up, OP's statement regarding businesses should still hold true.