I installed Windows 11 for my mum last week and can confirm there was definitely a pinned link to TikTok in the start menu tiles. This was by default after a clean install. (Unclear if app was installed or a link to install, but I just nuked it obvs)
Privacy violations regarding TikTok? I don't think it's a violation of privacy if one uses the service and therefore agrees to their privacy policy, which clearly states they collect a lot of data.
The collection of data, as stated in the terms of service, does not necessarily absolve the company of potential privacy violations, as it is ultimately governed by the laws of the nation(s) in which it operates.
TOS cannot supersede the laws of countries themselves.
I installed W11 from the ISO I downloaded directly from Microsoft a few months back and it had all these apps pinned (though likely not actually installed).