You can prevent the loading of most pop ups and many nag screens and cookie demands by simply having a browser configured with an "add-on" that allows you to toggle of and toggle on javascript. There are several add-ons available.

Alternatively, you have another browser with javascript permanently disabled and keep it minimized in the tray, or in the background.

A lot of websites that demand subscriptions, post nagscreens or use other blocks whereby the website can be read by simply toggling off javascript.

Javascript in websites has become what corporations use to manipulate & control us and do things like post nag screens & demand subscriptions.

When I run across websites that demand javascript before they will load I just shitcan them and eliminate them from viewing forever.