Net present value of 50% of salary for the next 30 years is something like a million dollars for most HN commenters, I'd guess.
Plus it'd almost certainly end with zero notice. You'd get a email saying "you're free to go". Suddenly. After say 26 months.
So it's not like a "pension for life" - just a gap in your employment history.
Any employment gap can be easily explained by saying "I was under a non-compete and being paid garden leave while working on personal projects to keep my skills fresh". It's very common in e.g. the finance world, I believe.
The uncertainty means you're still out on the job market looking for a real job.