September 7, 2021 was one of the most significant days in Bitcoin’s history.

El Salvador became the first country in the world to adopt BTC as legal tender — defying warnings from the International Monetary Fund.

It was a rapid rollout for the dramatic new policy, especially considering it had been announced by President Nayib Bukele just three months earlier.

Every single Salvadoran citizen could claim $30 in free Bitcoin if they downloaded the government’s Chivo app.

Meanwhile, Bukele excited the crypto markets by regularly announcing that the country was buying thousands of BTC to hold in reserve.

Source link: https://cryptonews.com/exclusives/has-el-salvadors-bitcoin-bet-been-a-success/

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They have been holding bitcoins every day since accepting bitcoins as legal tender on September 7th, 2021, I think this complements the DCA approach. Because they have been holding Bitcoin for the past four years, and their Bitcoin holdings were purchased at their 2021 peak.  And again in 2022 and early 2023 Bitcoin had very low buying prices, which I think they continue to hold until now. 
And the price of each bitcoin is on average (roughly around 40k) of bitcoins purchased. So it must be noted that no matter how much the price of Bitcoin increases, holding Bitcoin for a long time following the second method will definitely reduce the purchase price.