win.rar GmbH is a German corporation and as such is required to post their financial statements to the federal "Handelsregister". If you google the exact company name, you'll quickly find the Northdata site for them (Northdata is a crawler that aggregates Handelsregister data) [1]. According to that, they made ~1M€ in earnings in 2023.
[1] https://www.northdata.com