There are three other submissions in the queue and likely more on this.

I know someone in Epic and they told me that its no secret inside Epic that Roblox is killing them. Why? He told me a story where a neighbors kid came by and wanted to play Roblox but he told the kid he didn't have Roblox. The child replied "It's easy! I'll show you!" and this 8 year old sat at his PC, downloaded a few MB client, signs in, selects a game and is playing within minutes. The game was a brain dead platform jumping game where you jump to the top of a tower. No enemies. No items. No anything. Just get to the top. Yay. At one point the kid fell down and the game offered to move him back to where he was for $3. Yup a fucking game hit a kid up for hard cash. The people who makes these games are child predators. Scum really.

Epics problem is Unreal can't be easily deployed like Roblox. You want to play Lego star-wars? You need to first download the base Lego game of 30GB then the 20GB Star Wars pack. A Roblox user just downloads a small client, signs in and is ready to play a stupid simple game that isn't 50+ GB. Unfortunately most of those games are not games but attention stealers that entice users to spend real money on NOTHING.

Shame that everything has been boiled down to an attention and money milking scam.

The difference is that Roblox has a thousand "attention stealers" which have enough gameplay and multiplayer fun to keep an eight year old entertained for a long time. Fortnite is just the same recycled concept over and over, with an interface that is difficult for a child on a console. There are a number of Roblox games that are genuinely well-designed and fun, don't let the graphics fool you.

(Also, eight year olds don't have $3 in Robux unless someone buys it for them, so blame the parents as well)

No, Epic's problem is that they saw Roblox's success and went "we deserve that too because we say so, let's go all-in on this market that is already dominated by an established player!"

Roblox isn't killing Epic, Epic is killing itself by desperately trying to steal Roblox's players when they have no reason to stop playing Roblox. Even if they released a 50MB Fortnite client that streams low quality assets like Roblox, it would be no different because those kids would simply keep playing what everyone else is already playing. Tim Sweeney making another tweet about his metaverse or whatever isn't going to change that.