To the OP:

I think you are asking the wrong question. To me, there is no such thing as 'to blame' anybody when installing leaked, not ready firmware. Nobody forced anybody to do this. On the other side I am also not seeing the other extreme like 'it was not right' or even 'it is illegal'.

I think it is OK to do whatever you decide (as long as it influences only yourself / your property), as long as there is no whining afterwards and (that is the more important point) blaming anybody.

We are all free to do what we want to our property, but with freedom comes responsibility. For example the responsibility not to point fingers after somebody decided to do something risky and it went down the hill crashing and burning

Summary:
Do what you want, but when you leave the path, do not complain about being able to leave it, when you break a leg.

Best regards,
Corwin