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With bank transfers, it's pretty clear where that money comes from. It doesn't just miraculously appear in your account one day, but somebody transferred it there, and that person or entity in turn got that money from somewhere else that transferred it to them. It's traceable throughout. So my guess is whoever was bothered in your case didn't suspect money laundering, but was more concerned about possible tax evasion, as profit shares count as personal income and are as such subject to your income tax. If your boss paid you out through his personal account, there was a danger of obfuscating the true purpose of that payment to you, and thus evading income tax. Not to mention that it probably went against a handful of accounting laws and principles.
Money laundering works differently. You have assets that are generated, usually in cash, through illegal activity like drug or human trafficking, extortion, bribery or gambling, and many other things. That money is then not tradeable because it cannot be traced back to legal financial activity, and should technically not exist at all. The main vector for injecting those assets into the legal economy and thus laundering your ill-gotten gains into ostensibly legit capital is then often a cash payment for high-value goods like a house or a collectible luxury car or an expensive painting. What also happens frequently is that they deposit the cash into some offshore account in a country with lax money laundering laws, and then wire it to your bank account in Britain.