LEMON delisting was very sudden and I was never contacted regarding any problems, as far as I know there are no issues. Lemon is one of the leading Argon2 coins and has higher hashrate than most of them.
I contacted Cryptopia, I really hope they reconsider. If not, I will try to get LEMON listed on some other exchange.
They sent out there standard 30day warning to me.
But
They require a working block explorer, which i dont think lemon has (the one i have a link to is always way behind)
I also believe that all coin devs now have to pass the much higher ID requirements...so i am expecting that they will be delisting literally hundreds of old coins, esp if they can get hold of the devs.
I think all exchanges will unfortunately be doing same going forward.
I wish you luck.
J