Oh sure: billions of dollars in cash? Hundreds of lawyers? Lobbyists on Capitol Hill? A buddy at USDA or EPA? Lower unit prices on just about every single thing they need to buy? Brand recognition? Strong negotiating positions in 100% of their deals?

Bundle web browser with your operating system.

Bundle operating system with CPU.

But, both lost in the end, despite abusing monopoly and government intervention did not really help.

No, abusing monopoly and government intervention didn't allow them to keep their monopoly forever. That is not the same as "did not help."

And in any case, no one is arguing conglomerated companies have no vulnerabilities or never lose.

I'm saying they have advantages, which is obviously true by the fact that conglomerated companies tend to dominate their sectors.