

Even with a dumb phone, they have
- Your identity, IE real name and address.
- Location history
- Contacts (since you’re forced to use SMS)
- Message history in plain text
So I don’t doubt that they’re at least aggregating message history and selling data/trends about certain topics to advertisers and anyone who will buy it.
Plus if they know that your most contacted person is also texting/searching about certain things, they can safely sell that also and present ads to you based on their interests.
I wish trump were “traitorous” to the US project of native eviction, white supremacy and genocide, but he’s not, and neither is any US democrat.