Before we can always see countries decline the idea from investing on Bitcoin its because some of those countries call it as scam, volatile risk and afraid of global pressure brought up by some institutions like IMF that threaten them that they can't borrow money if they would engage to invest on Bitcoin.
El Salvador stand firm on what they believe is right for them. That's why right now they manage to earn good results together with gaining global recognition to lots of country on the world that looking after on their Bitcoin adoption made.
El Salvador would provably gain more success if Bitcoin will succeed to gather more global support and demands.
In fact, El Salvador never had a direct ban from the IMF on Bitcoin purchases. The IMF issued statements that El Salvador would no longer buy Bitcoin, but apparently this wasn't coordinated with Bukele, because we see El Salvador continuing to buy. Perhaps not every day, and with some interruptions, but overall judging by the volume, it appears they're continuing to roughly adhere to their Bitcoin purchasing strategy. I'm not sure about recognition from other countries, but I agree that El Salvador could reap significant benefits from this investment in the future if Bitcoin becomes very expensive.