Live-Ops (also referred to as Developer Events) is a Roblox system which replaced the event feature. It aims to better spotlight games by upcoming and established developers by featuring a few games on the splash page each day. This system does not provide catalog prizes, as developers are recommended to make their own in-game prizes for users who participate. Live-Ops were intended to begin on May 13, 2019, but were delayed until May 16th (3 days after Egg Hunt 2019: Scrambled in Time ended).
The Live-Ops system has been heavily criticized for its lack of catalog prizes. Users argue that this defeats the purpose for both developers and the players to participate in Live-Ops, as the games should provide catalog prizes instead of in-game rewards to allow greater customization for free-to-play users (particularly those who desire Robux but are unable to purchase it), although there are still promotions which have items available in the catalog (e.g. Godzilla: King of the Monsters). Users have also argued that this system ends traditions such as the egg hunts, Hallow's Eve, and other seasonal events.
In regards to catalog prizes, it should be important to note that Roblox actually announced that custom accessories would come eventually. This has lead to speculation that Developers can be able to create their own custom accessories to give out when their game is featured. Although there has been very little word of it since the announcement in 2016, some users who remember the announcement expect custom accessories to be incorporated into Live-Ops.