Why was what Tiger were doing considered acceptable until recently
How do you know they were not "on a warning" from DGCA? To fix the issue. You know just like they were told multiple times by CASA to fix issues, they failed to do that and were grounded as a result. I know that was under the UK wunderkind who was dumped but perhaps there is a poor culture remaining? Who knows?
I know that blaming DGCA is very easy.