Answer from Yobit to me:

Дoбpый дeнь.
Bвoд/Bывoд мoнeт бyдeт дocтyпeн пocлe oбнoвлeния иcxoднoгo кoдa кoшeлькa. К coжaлeнию paзpaбoтчики нe тopoпятcя пpиcылaть oбнoвлeния
- пoэтoмy, вo избeжaнии пoтepи cpeдcтв пoльзoвaтeлeй, ceть нe дocтyпнa.

Good afternoon.

Deposit Withdrawal of coins will be available after updating the source code of the wallet. Unfortunately, the developers are in no hurry to send updates.
- therefore, in order to avoid the loss of user funds, the network is not available.

I think the coin is dead - the last update of the github wallet was 7 years ago. If this is not the case, then the developers need to contact Yobit

I maintain the icoin-project repository at GitHub where the v1.4.0.0 release has been tagged.
This coin's code is basically stalled right now and I haven't worked on it for a long time.

The roadmap for iCoin is as follows: perform a network protocol upgrade form the old v0.6 Bitcoin code to modern Bitcoin sources.
I can go into depth about it here if anyone else has developmental interests.

It's basically a doable task, but doesn't happen without me or somebody doing it.
I still like iCoin and want to help though I have been detached from working on crypto stuff for the past two years w/ the pandemic crap and the world going crazy.

Best Regards,
-Chicago