Private companies without investors also elude the problems in the post, of course. (Though in both cases you may have to deal with an Uber-type competitor willing to subsidize its operations for long periods - something of dubious legality, but it still happens.)

Note that if you begin as a public benefit corporation, raising funds will be obstacle number one, since you must compete not just in your market with current-model companies, but also compete with them for funds. So no wonder it's more common for successful private companies to pay back their investors and then transform themselves into public benefit companies. This is still useful as an option, but hardly more than a start at a solution. Unless laws are changed, of course. If the law allowed public companies to change to a public benefit corporation without warning regardless of investor's opinion that would be a huge change - but might thoroughly discourage investment, of course.