I have mixed feelings about this. On the one hand, I am still a big fan of Android´s openess (at least compared to the walled garden that is iOS) and I think it should the right of every company or developer to NOT use a closed platform to distribute its app.
However on the other hand, this move by Epic sets a dangerous precedent: Factually, Google get´s economically punished for being more open than Apple. This does not feel right for me.
From a business point-of-view (when sideloading becomes more common) the "right" move for Google would be to fork AOSP, make new Android versions as closed as iOS (while still distributed for free) and prevent any sideloading. No sane CEO who is measured by increasing shareholder value could justify stayig open if this jeopardizes the revenues without providing major benefits.
I, as a user, think this is a sad and alarming development. However, apparently most comments and media do not share this opinion? Are there any reasons why Google deserves no revenues while Apple get´s 30%? When there are none, this situation can't be sustainable from an economic point of view.