why? SLES does not use any RHEL sources, they are all build in-house

They do maintain their own RPMs - but they also offer support for CentOS / RHEL for customers who use SUSE and RHEL. Their hand me be somewhat forced, as they have to continue to fulfill these contracts.

SUSE is working on making SELinux the default - and it already is on SLE Micro for example

That I look forward to, if they can make SELinux and cockpit work flawlessly I'm finally going to have the perfect distro I ever wanted (although I'll admit I'm not sure if NetworkManager vs SUSE own network manager is better).

not really relevant, no

I still use avidemux and microsoft video editor

I'm going to stop paying my taxes, because some other people also do not do it. If the IRS goes after me, it's discrimination, because they could've gone after someone else instead :)

doesn't make that much sense, does it?

Not sure I follow the analogy, but yes you could play the discrimination card in any circumstance.

I've never heard of Drosten saying something like that, could you provide a source?