Afaik, shortly after Fxpro presented a 24/7 CFDs crypto trading, they also introduced 24/7 client assistance (within a couple of months after this novelty).
So, these guys now operate round-the-clock specifically for those having a stake in trading cryptos on weekends. But, I warn you, having a rest is also obligatory for traders' brains, whether you want it or not. Advise you to alternate weekends trading.

It won't be practical for crypto traders because all the cryptocurrencies exchanges are working very fine during the weekend. It is not clever to shut down everything because support is idle at that time. So you still can trade and if you have questions you can ask but your answer will be answered during working hours.