Tutanota only requires you to pick a username and password, nothing else, well there is a captcha but they don´t ask for your name.
Although recently German Courts forced Tutanota.com to monitor an email account being used for blackmailing, this only applies to that specific account, mass surveillance is against German law.
You would have to be doing something seriously illegal for that to happen to you, and debating, even controversial matters, is not illegal as long as you don´t call for others to do carry out illegal actions.
German secure email provider Tutanota forced to monitor an account, after regional court ruling
As for your idea about Parler, the only problem is that people using alternative free speech networks like Parler.com or Gab.com are mostly right wing, they are there because they were kicked out of other platforms for being too "extreme", Gab.com is full of openly declared racists. Parler not so much I think.
The idea is good as long as other girl lovers join that network, otherwise it is going to be you debating with Trump supporters.