"Fraud" isn't how I would describe it at all. Pidgin has to be developed
constantly to keep up with changes to the proprietary protocols used by
Yahoo, Facebook, MSN, etc. Jitsi got its most recent stable release last
year, and many of them have gone through drastic changes since then, so of
course they're broken. What do you expect?
Also, you seem to think that your password is sent over to a server hosted by
Jitsi's developers, which is preposterous and tells me you know nothing about
how things like this work. Your information is sent directly to the network
that needs it. If you don't believe me, Jitsi's source code is available.
Sending over your Yahoo password to a server that isn't Yahoo would be
completely unnecessary and thus necessarily malicious. Jitsi is a program run
on your machine, not some SaaSS frontend.
As for SIP, I don't know since I've never tried (I don't see why you're using
it anyway, just use XMPP), but if it's failing on Ekiga too, that tells me
that the problem is with the server, not Jitsi. The fact that the error is
unclear doesn't mean that Jitsi is "faking the connection". Sometimes the
situation is just one that the client can't make sense of, or the client
can't even tell that anything is wrong.
Please stop acting as if Jitsi is the first case of libre malware that went
undetected for 13 years. It is not. It's just that the proprietary protocols
you are trying to use have broken since Jitsi was last updated. You can say
that it's a bad decision for Jitsi to support these protocols, and I would
basically agree; focusing on XMPP would be beneficial. But trying and failing
to support everything else is not malicious.