I don't know if ice cream is the best metaphor. You obtain the ice cream, you eat the ice cream, you excrete the ice cream. End of saga. But social media is something you invest time and information in. You build a reputation, you form relationships with others, yada yada. You don't just stop eating the ice cream like you haven't made any commitment.
... you lick the ice cream for a few minutes every day while your friends watch from a distance, the ice cream company monitors your behaviour and creates a profile of you.
As sores and other health issues appear you remind yourself that the ice cream still delivers some good things, and your friends will only spend time with you if you all eat the same ice cream.
The last decade has taught us to expect enshittification and we can only be left to wonder how quickly they'll execute on that process. How terrible can they make the product, without you leaving, is the min/max profitability optimization.
Of course it will get ads. Nobody expects otherwise. But right now, under the deal that is, it’s interesting enough to try.