You can just ... not select the option to upload your keys to MS? During the setup you get to choose where to store your bitlocker recovery key.

The last time I've installed windows, bitlocker was enabled automatically and the key was uploaded without my consent.

Yes, you can opt out of it while manually activating bitlocker, but I find it infuriating that there's no such choice at the system installation process. It's stupid that after system installation a user supposed to renecrypt their system drive if they don't want this.