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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
This is being blown out of proportion. These sorts of terms are pretty standard for a closed playtest, as it doesn't represent the final product and the developers don't want reviews to be published criticising things that will likely be fixed for the release version.
So long as this is only about the pre release and not about the game at all stages. Review embargoes are somewhat normal prior to launch.