What apps are you referencing that Meta/Facebook launched and failed to clone Snap/Houseparty/IRL? Their snap competitor is Instagram, and it's still doing very well. Instagram is _also_ their TikTok competitor, and Reels has done a solid job in that space as well.
Thing is, these were intentionally created as experiments with the expectation that they would be eventually shut down, with whatever learnings integrated into the mainline apps.
Since about 2017-18 there has been a unit at Facebook called NPE, New Product Experimentation, tasked with producing these.
NPE was created in 2017.
Facebook had "Labs" in 2011-12.
The same idea keeps showing up again and again every few years thanks to a hugely profitable ads business.