true, I do think some exceptionally large companies might need to be dismantled in whatever way (vigilante justice could make that possible because clearly most governments dont care about such a thing) but after that I think such a society would be very stable
not to mention, large corporations are also a lot less inefficient to run than smaller businesses (see Ubisoft spreading itself way too thin and trying to have as big of an audience as possible and failing by appealing to no one, and massive tech companies with incredibly bloated HR departments that don’t help). if there is no government subsidizing or helping them, than efficiency in running things becomes a much bigger factor in not just profitability but the survivability of a company. as an example, why buy a $70 triple A game that has like 20 hours of gameplay when you could buy a $20 roguelike made by an indie studio with potentially hundreds of hours of gameplay
It is also easier to hire laborers locally than internationally, so indirectly a lot more smaller businesses existing would lead to things like tariffs not being needed, and immigrants from places like India or Central America would be taken advantage of less by companies
additionally if you get rid of a government that gives people visas and lets people immigrate from all over the world with no constraints whatsoever, then being an immigrant would become more of a privilege than a right, and I think letting people voluntarily associate and run their own micronations how they see fit would lead to a bigger focus on local issues and help more things get done
Local businesses are also going to have more expertise on specific, local issues than international companies simply focused on generating profit, so reducing regulations gives locals a better chance to contribute back to the community and makes it easier for the needs of each community to be met. Of course restaurant chains could still exist, but they now have a bigger incentive to actually cater to the local populace