Now that March is here, let me ask: how many people involved in crypto, especially those under 30, have ever filed an income tax return in their lives? How many know what a pre-filled declaration is, for example?

When we impose this obligation on everyone who withdraws money from global exchanges, cold wallets, airdrops, DEXes, many people will make mistakes in these declarations, unintentionally submit incomplete or incorrect reports, or simply be unable to do so because they don't know how, risking penalties. A serious hardship will occur here.
My suggestion is that platforms with licenses in Turkey should implement a crypto transaction tax of 0.03% per transaction for users whose KYC is Turkish on global exchanges and collect these transaction fees on behalf of the government through Turkish platforms. This way, everyone pays the transaction fee regardless of whether they are earning, spot trading, futures, etc.
If this technical implementation isn't possible or if unlicensed global platforms don't want to do it, then for tokens coming from these platforms—especially when withdrawing from personal wallets—once the money is transferred to a Turkish platform, a small withholding tax (say 0.5%) should be automatically deducted regardless of profit or loss, and the reporting requirement should be removed. If you set a figure like 0.5%, no one will complain; someone withdrawing $100,000 would pay $500 in tax.
This way, those who don't want to pay can still find local platforms attractive. People involved in Web3—staking, mining, or accepting taxation on their principal—will focus on their work.
I just wrote down my initial thoughts; I am sure many competent people in the crypto market, if consulted, will suggest much better ideas on this matter.
Tax authorities and intermediaries are discussing this, but it would be great if the investors who will pay the tax could also listen.
In summary, the real issue here isn't the tax itself but the fact that a declaration-based model is unfeasible for users. Crypto enthusiasts want simplicity, straightforwardness...