The DOAJ now has a handy list of journals they’ve removed since the start of 2014. When you load the spreadsheet, switch through to the “Removed” tab to see them.

I wasn’t previously aware that if a journal hasn’t published in the last 12 months, it will be totally removed from the DOAJ, archive TOCs and all. JURN, on the other hand, is happy to index your journal so long as the archives are still online and open.