some very important info re: paid accounts~
I am not a lawyer, but I can decently interpret legalese and, being as I also suffer from tl;dr syndrome and assume others may as well, I took one for the team and went through the updated TOS for the post+ accounts and highlighted (what I understand to be) the most pertinent information, which ultimately comes down to this:
You cannot monetize copyrighted works (aka charge and earn money from fanfic, fanworks, etc) and if you do decide to put your fanworks behind a paywall via Tumblr, when you are inevitably sued, Tumblr will not protect you and will not defend you and you alone, personally, will be responsible for whatever monetary damages said lawsuit results in.
If anyone is a lawyer and knows I've gotten any of this wrong, please do not hesitate to correct me/this post.
1. Your paid account will not be hosted by tumblr; it is routed through a 3rd party.
2. By signing up for a paid account, you're entering into an agreement with Stripe, so in addition to Tumblr's TOS, you are also bound to Stripe's TOS.
3. Stripe, like Tumblr, will not defend you or protect you against any lawsuits.
4. Furthermore, you may end up owing Stripe money (indemnify = compensate)
5. Tumblr's TOS specifically states that you can't put any content on your post+ account that violates any laws, including laws that protect intellectual property rights of others. This is super important, because Tumblr's post+ FAQ also states that you can post anything that you would regularly post on tumblr, which I'm sure many will take to mean that gifsets, fanworks, etc are fair game, since all of that stuff can be posted on tumblr now. However, the difference is, you're not making money from the fanworks you're posting or reblogging now. Once money enters the equation, the game changes.
Tumblr is making it seem like any and all content goes for post+ accounts, knowing 90% of this site is fanworks. This is not true and you'll be opening yourself up for lawsuits if you charge for fanworks.
6. Tumblr further disclaims any and all liability in any legal issues.
tl;dr: Please do not make a post+ account, bc you will be opening yourself to lawsuits and if that happens, Tumblr's response will be not our problem, you agreed to all the terms which said you couldn't do that, sorry not sorry. Please protect yourself.