It's not blocked, you just can't use the Claude-only subscription endpoint with unauthorized 3rd party software. (You can use it via the regular API (7x more expensive) and pay per token just fine.)

...Except now you sorta-kinda can: now they auto-detect 3rd party stuff and bill you per-token for it?

If I'm reading it right:

https://news.ycombinator.com/item?id=47633568