As a small company/startup, right now, you design, make, and sell a product. It may just be you or a small team. The design of your product may be complicated, but the usability from the user perspective may be simple AND FOOLPROOF. There are no other considerations generally other than the product works, and people like it and my margins are good.
With more regulation, like requiring the right to repair, the task above just became a lot more difficult. You now have to design a product that can be repairable, which can be more expensive from your design/production side. You have to make sure there is documentation to go with that for consumers to repair every aspect of your product, an incredible amount of time. And then you have to have a way to "rescue" a user if they really screw up the product and "brick" in in a sense. This will add to the total cost and the time it takes to go to market and/or iterate on the product. Small companies in many ways, can't afford this. not to mention being in compliance of the regulations and the additional cost/time that will take.
On the other hand, a larger company will have no issue complying with these regulations as far as documentation, user support, return and fix issues, etc. Making sure consumers have the tools available to "repair" the products as well. Because larger companies have economies of scale, both with supplies, manufacturing, and labor costs, it is much less of a burden for them than a small company barely trying to survive.