Shutdown
Blockate was put under review by Roblox administrators on the 18th of September, 2019, however no reason or explanation was given. This is known as the September 18th shutdown.
Blockate came back on September 30th, 2019, which lead to the Halloween Event Submissions to be extended to the 15th of October.
Speculations and Theories
Many users suggested that Blockate was shut down for being a copy of Blocklr or for just being too similar to Roblox, but these claims were radical and not very credible. This is not a good suggestion because the owner of Blocklr said he didn't care about others copying his idea.
Another theory is that Blockate's head developer, Fewkz, had broke Roblox terms of service and got Blockate shut down; However this theory was also not very credible. Fewkz also didn't get banned in this period.
The most credible and believable theory is that the player-base has caused the shutdown, with many users thinking they were funny by building "items" that were against Roblox ToS, or more likely, the use of Discord Links.
Another theory is that it was shut down because of a popular game using copyrighted material from the Pokemon Franchise, although it was debunked.
According to Twitter, the Blockate team were trying to “Make The Game Playable Again”.
What really put it under review was that Roblox found off-site links in worlds (Discord, Twitter etc.) and it was fixed due to fox proving that it wasn't him and he would put more moderation on the game.
Blockate became public again on September 30th, 2019.