Quite some time ago (1980) a B747 was delayed in DXB for about four hours due tech.
When the aircraft landed in ZRH, the crew, having been on duty for over 12 hours, elected to go to hotac, rather than extend their duty period and continue to AMS. Note that this was permitted by company policy, as extension was SCD. When the crew returned to SIN they were summoned to Airline House and summarily terminated. The Captain (expat) was intending to leave to join SV and did so. The F/O found himself in the army three days later as his National Service had been deferred previously due to his employment with SQ. All were reinstated after a VERY long court case (except the Captain, who remained at SV). Considering the rather authoritarian nature of SQ management, it would appear that if those expats at SQ would like to engage in a "CX style" action, they would have a difficult time indeed.