They are allowing their inexperienced citizens to only invest $3800 in cryptocurrency unless they prove that they know what they are doing, and they have the crypto trading or investing knowledge. From one point, I am seeing it as a good step because they don't want their citizens to lose money on cryptocurrency, so they are giving them a cap to invest.
At first glance, this seems like "caring" on the part of the state, but is it really so? Let's look at the situation differently.
Does the state restrict its citizens from participating in lotteries or gambling (in monetary terms)? No. In other words, citizens can effectively lose an infinite amount of money on the lottery \ gambling. Or the traditional stock market: there are no limits on investment amounts here either.
On the other hand, it can be taken as state overreaching into the personal finances of a citizen. I wonder if they do it for stock or other trading as well.
I would call this excessive concern for the wallets of its citizens.

Yes, Russian citizens must use brokers to trade stocks, but the most important issue is taxation. Income from securities is taxable. Could this be the reason for the "excessive government intervention in citizens personal finances"?
I assume that the income from the $3,800 invested will also be taxed.
How do you see this step from the trading point of view? Is it good?
From an investor's perspective, any restriction on "freedom of action" is bad, as it prevents investors from fully "taking control of their financial lives". As far as I know, there are no limits on the amount of investment in securities, especially domestic stocks. Such restrictions appear to be attempts to influence the "direction" of investments and force investors to invest in the traditional (easily controlled) securities market (domestic) and stimulate the domestic economy.