Bitcoin would be a great topic for another blog post, we have a really long love-hate relationship with it. Don't worry, Bitcoin support will hopefully return to our store and gaming bundles eventually. We know what we need to do to turn it back on (more or less, hook it into our SMS verification system) but we have many higher priority tasks work on. We are hiring if you know anyone: https://jobs.humblebundle.com/careers/ :)
While bitcoin is great for preventing chargebacks, it is inherently anonymous. That is good for certain use cases, but when you are trying to enforce a strict per customer limit, it is a nightmare. We invested a lot of resources into doing what we can to combat it, but eventually we figured that we had more important things to do and had to tap out. Almost 100% of the bitcoin traffic was bad actors, and even so it was such a tiny fraction of our sales, like under 0.05%.
There are a lot of diehard bitcoin users, like yourself, and I would love to support your preferred payment method again, but it is an incredible amount of work to do safely.