system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel & MCU] Why are so many countries and organizations trying to replicate the Super Soldier Serum?

It doesn’t have a good record and super soldiers have largely been surpassed (in 616) by mutants  and other meta humans.

But in both 616 and McU, we see that so many different countries and organizations have attempted to replicate the super soldier serum. We know that super soldiers in the MCU can be surpassed by technology, magic, and other enhancements. Spider-Man has already been shown to be stronger than the Winter Soldier and could go toe-to-toe with Captain America. In 616, it would be more productive to hire equivalent mutants and magicians and in the MCU, it doesn’t seem super soldiers are that useful outside of PR/propaganda situations and some very specific commando operations.

A lot of the successes with Captain America in WW2 and the Avengers seem to be based on the personality of Steve Rogers. The other attempts have largely been unsuccessful with horrible repercussions Centipede, Hulk, Abomination, the blonde cop in Jessica jones, and Isiah in the MCU and Omega Red and Weapon X in the 616.

What’s so special about the serum and Captain America that so many different groups want to replicate it?
gpt
Meta Humans such as Spiderman are the result of very bizarre and unique circumstances that can not be (easily) reproduced. Governments don't know HOW people like Spider-Man got their powers.

But the Super Soldier syrum is different. If it could be replicated you could make an entire army of, well super soldiers. The only reason nobody has done it YET is because nobody has succeeded in producing a stable formula. 

As for tech, we'll people like Tony tend to keep the BEST tech to themselves.