Are there are citations/verification for the "used by" logos?
Basically they have every FAANG there, they're claiming that these companies use this, yet certainly at least for Google they have their own very active research and products going on in this area (DeepMind, wavenet etc) so it feels fairly implausible to me that they'd not be using their own tech that they are actively researching themselves, and instead use this?
Feels a bit fraudulent to splash these names and logos around without any proof?
Looks like they've got some decently popular open source repos - https://github.com/coqui-ai/TTS for example - so I wouldn't be surprised at all if Google and others used that, even if only for their own research and comparison. That's my charitable interpretation anyway.