More recently it seems they've added a login dialog to the site, but attempting to log in still just immediately prompts you to download the app[1].
Presumably once you've used the app to create and set up an account you can now use it to browse online, but that's not really "fully functional on web" and, relevant for the accusation of data-harvesting, still requires you to download the app.
Threads itself is launched in my region. Could you screenshot the front threads.net page you see (when logged out)?
> No app needed
Do you mean you're able to create an account without the app, or do you just mean that there's no app needed for browsing in your region (with no account, or after the account is set up through the app)?
The second screenshot is a form I can get to, but immediately after logging in it'll prompt to download the app to set up your profile.
[0]: https://timesofindia.indiatimes.com/gadgets-news/threads-mak...
I'm willing to gamble insane amounts on that's never ever going to happen.