Developers of 3DES don't use spam marketing. May be there are some guys that working for bounty use it.
I asked to PM about any issues with it. We don't like this too.
We (developers) use only official mailing in business slack channels (not channels of other crypto projects). Thanks!
Then instead of pm'ing asking whats the supposedly "some guys that working on bounty" username is, you should be more proactive and state very clearly on your bounty rule to never ever advertise on other projects specific space, its unethical and annoying.
The most ironic part is that the spam messages point to this exact thread. You're bringing this upon yourselves, deal with it in a more professional manner will you?