Mick Gordon's late but exhaustive response to the Doom Eternal OST controversy. What a shit-show.
Haven't read it all but he produced twice the amount of music than he was paid for, wasn't paid for 11 months, they had tasked someone else to do the OST without his knowledge six months before reluctantly giving him a contract to do it and then pressured him to complete a separate version in just a few weeks. Edit: with hours left on the deadline the guy in charge told him to scrap the songs he'd been crunching on and hand over whatever remained back to the other guy 
Bethesda 
https://medium.com/@mickgordon/my-full-statement-regarding-doom-eternal-5f98266b27ce
I'm surprised at the stockholm syndrome I see on display from creatives like these.
He should've told Marty Stratton to go fuck himself and put Pong music in DOOM. If they don't pay you for 8 months, you don't keep working. You send out a notice that work stops until you are paid and they've breached their contract.
I've had toxic clients like this, today actually. One that complained I didn't respond to her avalanche of emails within 24 hours.
"I don't think we want to move forward if you don't immediately respond to my messages blah blah blah" and my response is always something like: "Sorry to hear we're not a good fit I agree it's better for all parties involved if I don't waste more time and effort on your project".
Also up front payments. They don't pay, you don't start the work. Simple. And do paid Discoveries, Clients think they are bullshit (and they mostly are) but you will run into the red flags like missing appointments or secret stakeholders early without having the risk of doing unpaid work.