I tend to mine immediately profitable coins, though - of course, just because they're profitable for me doesn't mean they are for everyone, which stops it from becoming unprofitable.
yeah mine and dump immediately is what most do. The more sophisticated mine stuff at low diff with only small competition that's coming back later because it is being revived. So the ones mining for the most profitable to dump immediately are the ones with the most competition and also the ones that keep all these bait and switch scams running with their hardware and thus taking away their own source of income for the future since altcoins are drying up because of that. We're here to salvage the mess you made
The logic 'it needs to be unprofitable for someone else so it is profitable for me' doesn't apply in crypto generally. That's just in your head. It's true because everyone thinks so and acts according to that belief. Also the reason no value is created around here. 99% of coins gravitate towards zero value. You think that's normal? Coins have to be vapourware? They just must be? Can't be different? Perfectly normal?
It's easier if you're mining faster than everyone else on the same hardware.