Surely a lot of the load can be attributed to AI hallucinated submissions, but even then those need to somehow be reviewed on the off-chance that it's a real and important vulnerability - which would have usually been done by the human reporter in the past :)
At least on Android, Nintype has a few annoying bugs now and has gotten terribly slow. But it's an incredible idea and I wish it would get revived by someone - I still use it despite the bugs, but I need to switch over to Gboard sometimes.