Any way to purchase Cryptomator licence without KYC?

They do.

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Buy coupons, voucher codes and gift cards for privacy services and pay anonymously with Monero, Bitcoin or cash letter. SEPA Bank transfer is also available.

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Hook for their FAQ:

Cryptomator

Cryptomator - Downloads

Cryptomator is an open-source encryption tool for secure cloud storage. Protect your privacy for free on Dropbox, Google Drive, OneDrive, and more.