For fairness, here is Tuta’s response to the allegations: https://tuta.com/blog/tutanota-not-a-honeypot
There really is no way to verify that any email service isn’t a honeypot. Even if you open source your server code, that doesn’t mean it’s what’s actually running on the server. They could publish served code then be running totally different code on their servers with no way to tell.
Tuta’s biggest weaknesses for me right now are the seeming lack of independent audits and the lack of interoperability for encryption. Proton is the biggest competitor and seems to have both. However, Proton has grown more in the way that a honeypot would, adding VPN, cloud storage, password manager, etc, so more data collection points. Tuta is still email, contacts, and calendar.
PineTime 11mm
Samsung Galaxy Watch6 9mm
Apple Watch Series 9 10.7mm
Google Pixel Watch 2 12.3mm
Rolex Submariner (non-smart) 13mm