Unfortunately it's opt-in and if you don't have an account (like me) it can be a pain to constantly look for the little itty bitty link to revert back.
The best part is that the subs I lurk have banners that only appear in the redesigned view that instruct you to use old reddit because they rely on custom CSS for filtering and other things.
It's amazing that reddit management has thrown it's creators under a bus in search for monetization.
To be fair, it isn't really a "forced" UI change, as you may disable it in the settings or use "old.reddit.com" as URL.