If they don't tell you, then just assume they do
It's amazing. 30-40 years ago, people were terrified of surveillance bugs and being spied on by the government. Now we pay companies to do this for us.
Amazon is too large of a company to not do it, remember the government PAYS companies to access their users data. Them giving access to the data is just another revenue stream.
Some poor schmuck at the FBI is gonna get real tired of hearing me get Alexa on "Deez Nuts" jokes REAL quick.
If it's in the cloud for more than 90 days the government has already said it is fair game for them to harvest.
1980’s: “I think my house might be wiretapped man!”
2018: “wiretap, order me cat food”
Here's a simple flow chart to know if a company is giving or will give your data to the government
Seriously. Why would you ever live under the impression that your data was secure in someone elses hands. If you're willing to hand a total stranger your personal data, why would you expect they wouldn't hand it to the government if compelled or would otherwise handle it with any more caution than you did?