Many sites are starting to use magic link auth more often and I am wondering if its a trend to also glean more information from the account holder.

I dont like this auth process because it forces me to have to use the email system to authenticate every time which adds to the amount of time it takes to log-in. With Claude.ai, the auth process at least gives you an option to use a code to sign in with after you get the email. The problem is, the email doesn't contain the code. You have to click on a link which opens a web page to gain the code and it appears at that point it wants to do an HTML canvassing operation. I feel like that is a violation of privacy to do this at the point of trying to log into a service I pay for. I'm wondering if I am off base or if anyone notices this, or finds a difference in the process. and if its happening, what can be done about it. Also I wonder what the real reason is why more and more companies are moving toward this authentication method.