The Gripen has advantages for Ukraine. It's a more rugged aircraft, with lower maintenance demands and lower operating cost. It can operate from very basic airstrips and roads. Saab boasts about this.[3] Their pitch mentions that servicing an aircraft between missions requires just one trained tech assisted by five other workers. The USAF likes to operate from big, well-equipped, secure air bases, and US aircraft tend to be designed for that environment.
The US has, in the past, tried to discourage other countries from buying the Gripen, to protect US manufacturers. That sales advantage just disappeared.
[1] https://min.news/en/military/a409faa4bc530b328f75ed6ccff23b7...
[2] https://euromaidanpress.com/2025/03/04/saab-ceo-pushes-for-s...