It it possible to avoid kiwi.com's automatic online check-in and instead do it manually by yourself? asks if it is possible to avoid automatic check-in on kiwi.com
My answer is that I have done so many times. Below is the answer quoted verbatim:
Once you identify the specific flight, you can always go to another site, including the airline itself, to book the flight. And of course you can check in with the airline directly as well. I have booked many flights with Kiwi, but I have always checked in on the airline’s website or at the airport.
I have only once paid for a seat assignment, and that wasn’t with Kiwi.
Sometimes, I’ve found Kayak slightly cheaper than Kiwi, and sometimes the airline itself. And more than once, Kiwi has claimed that my charge was declined and asked me to send them images of passport and driver’s license. Big NO on that one! (In each case, I booked with the same card via someone else.).
Someone else who has not even used Kiwi at all thinks that is not an answer. My contention is that when I book on kiwi and do not let them check me in, I am clearly showing that it is possible to have them check me in.
Furthermore, I also believe the person who asks the question should be the one to determine whether it answers the question.