Just saw this post and can make an update if anyone is interested.
I play at the SSF Bintang (part of San Mateo County). They were closed from March-June 2020 when Covid first hit, then reopened for some time in June. Was definitely very exhausting to play again after a 3 month hiatus.
They closed again around Oct/Nov 2020 until early 2021 (Feb/Mar) when it initially reopened at 10% capacity. Now in April 2021, per San Mateo County, gyms are opened to 25% capacity so I typically see 4-5 courts occupied.
I would imagine the other Bintang gyms are operating at a capacity allowed by their local county tier status.
As a side note. Each time I returned to playing badminton, the first 1 or 2 sessions sucked bad. Also, because strings had not been used for a while, tension has dropped, but I’m able to play along with it. Going 1 hour 40 minutes almost non stop (with short breaks between games to get our money’s worth) with 3 other players at near full tilt is no joke. The silver lining is that it’s like very intensive cardio to make up for lost time, but I’d still advise people to take it easy when first returning to play on a regular basis.