everyone likes to pretend that roblox had a downhill death spiral beginning with erik's death or ticket removal when i can vividly remember people complaining a forgetload about the game back in like 2010-2012 well before either of these events occurred
roblox has been regularly criticized ever since a couple of years after its 2006 inception and nothing has changed since
and yeah this stuff has been pretty obvious for years at least to me. unless you are one of the most popular games on the platform (adopt me) you arent going to make a significant sum from the devex program. ive viewed this as the cost of convenience: roblox provides you with the engine/distribution platform/infrastructure/etc in one package but at the consequence of roblox largely being the one reaping the rewards of your work. roblox is fine if you just want to screw around and make games for fun but if you are serious about game dev and profiting from your work then you are much better off going straight to a proper engine like unity and building from there
Yeah, Roblox's decline really started around 2011, 2012 when they got more aggressive with monetization. Ultimately it resulted in me buying Blockland in mid-2011 and honestly, it really is the better game. I joined Roblox in 2008, and realizing that 95% of the playerbase is younger than my account makes me feel loving ancient.