There are very obvious, important differences between the options they had available. Both in terms of general user expectations for end of life apps, as well as concrete promises made to their customers to make a sale.

Do you apply the same sort of lazy false equivalence to all moral and ethical questions? People will always complain, therefore you can do anything!

I don't think I've ever complained about an app going out of business and discontinuing updates, but I don't have any patience when they take active steps to renege on their promises by adding ads or taking features away - that's just fraud.