From the article: > Each request also isn't sent as soon as it's generated. A number of these records are created and stored locally, then uploaded (note the s

From the article: > Each request also isn't sent as soon as it's generated. A number of these records are created and stored locally, then uploaded (note the sequence_number field). Even if a person is offline while reading, this data is stored and sent when reconnected. That being said, if you leave airplane mode on permanently and sideload books, you should be fine.