I am speaking for myself and myself only, giving my vision and my opinion. Take everything here with a grain of salt and pepper and do not extrapolate as someone else's words and opinions!
Yes, they are working on it.
I remind you that they are people, with day jobs and lifes.
They have their own things going on that need to be taken care of, which are more important than the bypasser.
And the bypasser is being taken care of for free, which makes it less "valuable" than their lifes, in my own opinion.
So far, there hasn't been any known way to go around the xigncode, but as soon as there is one, you will know.
There were found some old ways to do it, but, they still haven't tested them all for the reasons said above.
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Also, "loads of ppl are unable to multiclient and losing alot of farm" is kinda false: you can still do it but you risk getting banned.
The main reason to develop the bypasser is to get rid of that cancer that causes all sorts of issues.
The lost farm is less impactful than the disgraceful fps that xigncode causes to some people.