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Marvels Rivals requires creators to sign a contract that removes your right to give a negative review in order to access the playtest
(files.catbox.moe)
On today's episode of "This shouldn't be legal"...
Source: https://twitter.com/A_Seagull/status/1789468582281400792
You can't "just start" a class action suit. You need to sue, get other people to sue, coordinate, and apply for class action status. That's more time and effort than an individual suit.