Either way, there is something wrong and you should try and help solve it by reporting it.
That is not how KDE works. KDE is not a company and it doesn't absorb or embrace other projects. If you have a project you would like to develop using the advantages afforded by KDE, you can put it through the incubation process and then, when it passes, work on it yourself. The other KDE contributors that join you (if they join you), do so under their own steam. There is no management telling people where to go or what to work on, so if you stop working on your own project and have been unable to attract other contributors, development will stop.
KDE does not "take over" projects. Project leaders can request becoming part of KDE and gain all the benefits from belonging to a bigger community: infrastructures, translators, services, etc. But if the original developers do not push their own project forward, it is unlikely anyone else will.
We phased out "KDE" as an acronym years ago.
¿Puedes mostrarnos vuestro proyecto y explicar un poquito cómo lo hacéis?
This is indeed a bug and can reproduce on Arch 6.1.0. Please check if is has been reported at https://bugs.kde.org, and, if it hasn't, please report it.
Edite: Submitted - https://bugs.kde.org/show_bug.cgi?id=489025
Love the colour preview. Love the image preview. Was going to say "I can see why some people would want to disable it", but then could not think of any reasons, so I can't. That said, OP can go to
Settings > Manage Profiles > [Their profile] > Edit > Mouse > Miscellaneous
and uncheck Preview Colour on Hover.
"Problem" solved.
Someone creates a username/password in System Settings and then activates the server on the remote computer. Then they need to approve you the first time you try to log in from your personal computer... I'm not sure this answers your question.
KDE is not funded by any EU entity. Some project developers applied for small grants. Some got them, but these are individuals that happen to develop projects within KDE and the funds went to them.