It does not take any funding to create accounts a few days in advance. Automating account creation is probably the most basic step in any troll's toolbox.
reactionary basement neckbeards who wouldn’t post the same stuff a day later.
Trolls who give up after a day aren't trolls, they're users having a bad day. And if they're stopping after a day, their impact on everybody else is miniscule.
On the OTHER hand, as everybody has pointed out, you're badly impacting the new user experience. Bullshit posting restrictions on reddit are one of the worst things they came up with. Let's not replicate all the user hostile stuff they implemented.
We really need a comm for commentors who aren't lost but just plain clueless. Something like 'c/rtfa'