Uber’s PR team probably rushed the news out right after Lyft’s IPO announcement to make sure that investors would spend as much time to consider its prospectus as they do Lyft’s.
The possible market crash in 2019/2020 predicted by quite a few prominent economists and approximately $1 billion a quarter burn rate [1] have for a while been major reasons for their upcoming IPO.
[1] https://www.bloomberg.com/news/articles/2018-11-14/uber-reve...