This is just as idealistic as commieshit. Monopoly is the natural outcome of capitalism. I'm really curious about what you think causes Capitalism to become "crony corporatism".
Monopoly being the natural outcome of capitalism only really applies if you go full Randroid or lolbertarian and don't have proper anti-trust regulations.
The big problem of unchecked crony corporate monopolies and oligopolies emerged in the United States due to a variety of factors, starting with extensive de-regulations and the over-application of the "trickle down" economic model starting in the 70's and 80's.
Most of the anti-trust laws we have on the books are largely unenforced or under-enforced, and that's the root of the problem with Wall Street and Silicon Valley.
At the risk of being branded as an "enlightened centrist" strawman, I do think people forget that there is a middle ground between full-fledged state socialism and completely unchecked Ayn Rand-style corporatism. Everybody seems to think in absolutes these days, and it's a problem on all sides.
Capitalism is not perfect, and it has its flaws, but nothing is perfect. But the best system for the modern era is capitalism tempered with the proper regulations to prevent going full Randroid.
It's not ideal and it's not perfect, but I can't think of anything that could work better and doesn't hinge on a post-scarcity utopia or humans being absolute perfect angels.
I'm not some deep thinker and I don't see myself as such. I'm just some random nobody on the internet with his own opinions like everyone else. So, take my words with a grain of salt.
Maybe there is an ideal system that works and we just haven't thought of it yet? Who knows?