Your intuition about ethical dilemmas in finance is not entirely misplaced. I know all the arguments about finance and trading being useful because it is the process by which capital is "efficiently" allocated in the real economy, but that's academic fantasy which ignores how the real world works. The truth is, in order thrive in finance (and, by extension, crypto) you need to be someone who is perfectly happy being "ethically flexible."
By the time you start running into these ethical dilemmas, you're typically in too deep and it's too late to get out. You justify it to yourself because you're just a small cog in a big machine who can't change anything and you need to earn a living (and have gotten too dependent to a certain level of income that you can't earn anywhere else at that point). You can relatively easily make as much as a doctor or lawyer, but I can assure you that in a successful finance career you will need to "ethically flexible" whether you like it or not. A doctor can go home knowing that they saved lives, in finance you'll feel the pretty much the exact opposite.
You said the competition for postdoc is rather fierce, the competition for other jobs (e.g. AI and finance jobs) is just as fierce if not more. Basing your decision on fear of competition is not a good idea because every career or job is highly competitive.
You need to pick a track and work on it. Significant learning is part of it, but I should also mention that your network is equally important if not more. You need to build your network. One way to do this is to stay in touch with people you went to school with, not least because some of them will get jobs in your target field, and they might be able to help bring you onboard. Another way to network is to ask out people you don't know (e.g. that you find on LinkedIn, or profs or whatever) for "coffee" to learn about their industry - this is known as an "informational interview," you can Google the term to learn more. Good luck!
Your intuition about ethical dilemmas in finance is not entirely misplaced. I know all the arguments about finance and trading being useful because it is the process by which capital is "efficiently" allocated in the real economy, but that's academic fantasy which ignores how the real world works. The truth is, in order thrive in finance (and, by extension, crypto) you need to be someone who is perfectly happy being "ethically flexible."
By the time you start running into these ethical dilemmas, you're typically in too deep and it's too late to get out. You justify it to yourself because you're just a small cog in a big machine who can't change anything and you need to earn a living (and have gotten too dependent to a certain level of income that you can't earn anywhere else at that point). You can relatively easily make as much as a doctor or lawyer, but I can assure you that in a successful finance career you will need to "ethically flexible" whether you like it or not. A doctor can go home knowing that they saved lives, in finance you'll feel the pretty much the exact opposite.
You said the competition for postdoc is rather fierce, the competition for other jobs (e.g. AI and finance jobs) is just as fierce if not more. Basing your decision on fear of competition is not a good idea because every career or job is highly competitive.
You need to pick a track and work on it. Significant learning is part of it, but I should also mention that your network is equally important if not more. You need to build your network. One way to do this is to stay in touch with people you went to school with, not least because some of them will get jobs in your target field, and they might be able to help bring you onboard. Another way to network is to ask out people you don't know (e.g. that you find on LinkedIn, or profs or whatever) for "coffee" to learn about their industry - this is known as an "informational interview," you can Google the term to learn more. Good luck!