Have been noticing this recently with substack.

What works for me on iOS is to first scroll down until the "subscribe" splash, close it, and then reject the cookies.

Sometimes I still need to click some combination of "only necessary" and "reject" a few more times

Sad thing is the performance and experience would be far better if they didn’t ask me to set some unnecessary cookies.

But then they couldn’t sell my data.

Same, reader mode to avoid

No problems whatsoever with Firefox Focus/Android.

Same on Chrome/Android