I haven't been following it closely, but Nikita posted recently that they were running experiments to de-monetize the top accounts found to be reposting spam content. I don't know where it went, but he did say that in the A/B test the people who were no longer seeing content from those accounts were showing better interest in the site.

He seemed to get it. It's too bad he's leaving.

Nikita publicly talked about wanting to go even further to kill those spammy foreign reposter accounts but X eventually pulled back at some point. Lots of the big X accounts complained and they came to some half-way middle ground where they released the country-of-origin feature + a more limited demonetization campaign. Which is still admittedly better than most social media companies have done about the issue. I guess those low quality reposters are just too popular among the public (Youtube shorts is notorious for this).