So let's review the title:
> Retool is reselling our API...
According to TFA, they are not selling it.
> ...without permission
Except that your MIT license is permission.
I noticed the CEO has shown up here to say he's looking into it. I genuinely feel bad for him. Imagine that conversation.
"Guys I hear we are using this open source project and people say we shouldn't"
"....yeah? It's open source. It has an MIT license. What's the issue?"
"Apparently that person didn't REALLY mean for it to be open source, and now a bunch of people on an internet forum are upset."
"Do any of them pay us?"
"A couple I think? Two said they might stop paying us."
"....I'm confused boss, what did we do wrong?"
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Now imagine that conversation having to happen and this worry happening every time someone decided they want to use a FOSS library or API for their work.
Can't imagine why OSS is having trouble.