These status match offers from number of airlines come and go yearly. Last year, I took advantage of status match offers from Alaska, Etihad and SAS. They can come handy for extra miles, lounge access, and for matching with other airlines.
Now, Air France-KLM has a status match campaign for Flying Blue Gold status from any alliance. Airlines don’t normally match within an alliance, but this would indicate matching from other SkyTeam airlines as well.