These skills listed, come with a guarantee to yield at least $10k/month profit in 2023 right now:
Making $10k per month is not as simple as it allowed you to type. It is not enough to have the aforelissted skills, you really need to be an expert in any of those skills, being exceptional to the later. You also need some kinds of capital to push your success of earning $10k per month.
• Can gambling or crypto trading/crypto investment be considered as a skill?
The later is a skill while the former is a mixture of skill and luck.
• Can a gambler or crypto trader/crypto investor earn as much as $10k in a month besides any of the aforementioned skills?
It depends on how much you are willing to gamble with. Someone gambling with $100 may not win $10k forever. But someone who gambles with $2k can easily win $10k. Also, a trader with a capital of $2k can hit $10k unlike another with $100 capital.
• is it even okay to classify being a bitcoiner/signature/campaign member as a skill? If yes, under what skill bracket can it be included?
A freelancer is more appropriate. Considering that writing is a skill, if you are able to write well, get merits and eventually hired by a manager, it means you have a good writing skill.