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They are not, although Poolside FM was the first one to use the "Poolside" name.

Poolside AI filed a trademark infringement against "Poolside FM" that forced Poolside FM to change their name to "Poolsuite"

This annoyed the founder of Poolsuite and they ripped off his brand.

Poolside AI was only founded in 2023. Poolsuite changed their name in 2021 because of a trademark infringement with the band Poolside, from LA.