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yes, it was removed in patch 721 
 

Now when you don't have enough crystals, there is the option to upgrade with tankoins, and if you don't have enough tankoins, the message you say pops up, then in this case you don't have enough crystals or enough tankoins to upgrade

In this case, it's not the game's fault, it's been a long time to not know the update schedule and know how to get informed. In any case, you can contact support (help@tankionline.com) to request a refund.

on mobile currently it is not possible, but it is planned to pass the characteristics of pc to mobile

if you mean this, as it says in the description, now there is no pass, it can only be changed from settings

It's not XP you have to earn, it's battle points.

 
They are special missions to earn special augments, in this case striker and dictator

for the moment we don't know

Now pro battles have a limit of EXP and crystals. Here you have all the information: https://en.tankiwiki.com/PRO_Battles#Earning_crystals_and_experience_points

I have not affirmed anything, but I think that if it is not done on the indicated date it is POSSIBLY canceled for the next year, or it could also be the second option that I said. Let's see if the devs say something tomorrow in the mini vlog that will be

You must use a drone, and for future questions or topics, do it in English

Well, only that, the clan tag and a chat of the clan, nothing more

not exactly, parkour reports are just not accepted anymore, but using hacks is still prohibited, now you can't use vote in parkour anymore, but if a battle moderator is in the same battle as the hacker, then he can be punished

Today the tanki fund has ended, tomorrow the prizes will be given (along with the livestream of the tankoins giveaway)

on 28 after livestream

If I remember correctly, they said they would come back gradually, but at the moment we don't know anything

I have simply waited, they take time to arrive

You can see the latest railgun change here:
https://en.tankiforum.com/topic/396300-patch-update-710-released-16th-december-2022/

for the moment they have been removed, but in the future they will return with the contract system

you can get them in ultra containers

On the 28th the prizes will be given (in addition to the giveaway that will be made)

it's for the event "Tanki Online and Loss of control". 

I think you should contact support for this problem: help@tankionline.com

hey! 

there are currently problems with the event

the only way is inside the game