Could that back fire? There are cases where humans judge taking no action because it avoids costs as inherently better than taking action to bring in profit even when others in general are better off. I could see a lot of people getting mad at being charged for updates which cost money who wouldn't get mad when there are no updates because the company doesn't want to lose money making free updates. It's almost like a section of society judges not helping as better than helping for some price, even though anyone who doesn't want to pay is no worse off than if they were never given an option. I see this trend outside of business as well.
It would certainly not be good business for a consumerism-centered brand like Samsung and it would even be suicidal for Apple to suddenly start charging for updates. But for an Android brand built around sustainability, like e.g. Fairphone, it could be a considerable credibility gain if they replaced a promise of future gifts with a proposal for future business.
No matter how updates happen, if they do the effort will be paid for with money coming from the customer, one way or the other. Any payment scheme other than pay on delivery requires trust and that specific form of trust has evaporated a long time ago.
