You should do your own research instead of just collecting half-knowledge about a wannabe artificial intelligence!
############## MONEY ##############
There are no "free" messengers in this world. They all need money for employees, programmers, offices and servers.
Please always look very carefully at where the money comes from and you know who is behind it.
SimpleX Chat received 380,000 dollars from Village Global. This is the venture capital company of Jef Bezos, Mark Zuckerberg, Bill Gates, ect.
This means that big tech companies have already long been involved in SimpleX Chat!
See
https://www.crunchbase.com/organization/simplex-chat
and
Also involved Jack Dorsey and Asymetric Capital Partner!
Threema, on the other hand, is only paid by its users and is therefore only obligated to its users!
########### Servers #############
SimpleX Chat don´t know how many servers they have!
Then they also don't know who is behind some servers!
This provides a large attack surface for collecting metadata. The big tech companies only need the IP address and they know which user it is.
How do they do that?
85% of all smartphones use Google's Android and this sends encrypted data packets to Google every day. This means that Google knows the IP address of every user.
Amazon (online shopping monopolist in Western countries) knows the names & addresses of users (if an order was recently placed with the IP)
Microsoft (operating system monopolist worldwide) knows the IP of the home computer and Internet router.
This is the reason why it is insanely dangerous to get involved with money from big tech companies.
They don't put their money into SimpleX because the logo looks so great, but because they want a “foot in the door” and data.
PS: The same goes for Signal, they also run all their traffic through Google, Amazon, Microsoft & Cloudflare.
What does Threema's server do?
It only stores messages until they have been successfully delivered to the recipient and then deletes them again. The message is then overwritten by new messages on the server disk. This means that the deleted message cannot be recovered.
This seems to me to be a much safer way than using a service like SimpleX, where the operators don't even know who is behind their server.
And that "paper trail" with Threema is totally bullsh*t! No Threema User needs to give out any personal information = 100% anoymous!
And the ThreemaApp itself can be purchased with Bitcoin or Cash = 100% anonymous.