[image shows the following text "Log in to use old Reddit
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[image shows the following text "Log in to use old Reddit
To keep Reddit safe, accounts are required to access old Reddit. Log in, or continue without an account on reddit.com."]
XCancel and redlib will let you browse both without an account, and while cutting out most of their ad revenue as well (bots/marketing accounts notwithstanding of course)
Firefox extensions:
https://addons.mozilla.org/en-US/android/addon/redlib/
https://addons.mozilla.org/en-US/android/addon/xcancel/
Redlib is also much easier to use on mobile than old reddit, but posts are rate limited to every 12 hours or something. So it actually helps stop you from doom scrolling a bit too.