There have been plenty of other forks that were worth claiming and in most of their cases there definitely was a time limit as they became worthless or the chain died.
Time is essencial when claiming those forks. That´s a problem, because good wallets (or at least functional wallets) take some time to support those forks. THen you have to go to shady wallets and shady exchanges to trade them... but most of the time they are worth claiming if you act fast. Look at OP prices, there was quite some money for a full btc.
Bitpie/Bither allowed you to claim some of the obscure ones. On checking some of them again the other day most of them are now stuck in there forever.
I could never make that wallet work, and I never trusted it. So confusing and I was never able to receive any btc from the forks I saw my balance there....