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That’s not how Trezor works, they built the first hardware wallet, and made it fully open source. Several blockchains have since added support to Trezor, it’s not the job of Trezor to do so (similar to how many ledger apps weren’t developed by ledger).
Specifically, Keplr is the most suitable player to add Trezor support (which is massively facilitated by the fully open source Trezor bridge), just like metamask did (amongst others).