In case you've forgotten ... the reason Mark and Elon are talking about fighting each other (for real) is because of this new service that Meta is rolling out called 'Threads -- which is said to be the "new" Twitter, if you, will ... only, it'll be rolled out under Mark's watch.

When Elon caught wind of MZ's new toy last month, he jokingly said he was willing to battle the guy -- and now, it's full-steam ahead on negotiations as they prepare to duel.

Welp, the impetus for this all came full circle Monday ... with word of Threads' supposed launch date being revealed as July 7 -- with the option to pre-order it now available on Apple's app store. There's more info as well as to what sorta data it's going to harvest from users ... something EM couldn't help but comment on Monday, taking a swipe.

In response to all the ways Threads is going to manage personal data (mining a helluva lot, frankly), Elon replied ... "Thank goodness they're so sanely run." That carries significance.

Reports have suggested that a Meta executive told staffers recently that Threads would be "sanely run" compared to Musk's wild west on Twitter lately -- but it sounds like Elon's scoffing at how much freaking user data they're going to control in order to do so.

Of course, you could argue Elon's probably a little worried about this new foe on the market -- especially in light of his absolutely hated decision to limit Twitter users' daily tweet count ... as far as being able to see new content. He's upped the count since the debacle this weekend -- but folks are still pissed and certainly looking for an alternative for news.