In the past week (as of May 10, 2025), El Salvador has purchased a total of 7 bitcoins, and 30 in the past 30 days, indicating that it continues to implement the "daily purchase" strategy.

But they borrowed $1.4 billion from the IMF in December last year, so I feel that they used the loan money to buy bitcoins, even though they promised the IMF not to use public funds to buy bitcoins.

Then I have a question, that is, the current bitcoin price is so good, why doesn't El Salvador pledge bitcoins to lending platforms to obtain an annualized rate of return, which is about 6% to 9%, and they have 6188 bitcoins, worth 657,911,721USD, and can earn 59 million USD in interest each year.
How much help does this have for the El Salvadoran economy?