I don't think that thinking is a sustainable one. If something is
important, we have to create that service collectively. We cannot say Freedom in the so called 'cloud' is only a matter of choosing what is currently available. If we can organize enough people, we can run such a service.
Rejecting it may be easier option, but we can't always expect freedom
to be easy.
Remember that we can always collect data by asking them to send form via emails. Also, we can send the form via KoboToolbox form to people and say:
1. block google analytics cookies
2. if they don't prefer filling form via that form, they can send the details asked via mail.
In this case, the visitor can either avoid the server or block the cookies. Both are acceptable to me.