最近有個查證Is it really FOSS平台，用來查核部分聲稱是開源平台/軟體，其所用條款是否真的符合FOSS
Tuta在該平台上被定義為非FOSS：
//The service provided is not open source, or source available, but just the email clients provided are provided under a GPLv3 license, not the service itself.
//They have stated they’re aiming to open source their server side elements also, but this does not appear to have been achieved 6 years after mentioned there.//