An alleged Unity employee (looks legit) posted that Unity is aware developers may lose more per install than they earn, even to the point of bankruptcy but that they would "fix this with the customer to not bankrupt them".
https://forum.unity.com/threads/unity-plan-pricing-and-packaging-updates.1482750/page-55#post-9299384
But look: No serious business would leave a matter of potentially going BANKRUPT to be addressed by some future ad-hoc fix at another company's whim. That stuff needs to be up-front and contractual, even with companies you trust, let alone with Unity!