This "Bark" person in Twitter has literally no fucking clue whatsoever, I mean ZERO clue, the level of knowledge of a particularly dumb stone which somehow managed to end up in the shoe of a statue thus being the most useless meaningless shoe stone ever.
In the context of money laundering, "$5 billion in suspicious transactions" means that $5 billion in customer money moved into, out of or through BofA accounts and said customers or the transactions are suspicious (legally that would be things like "terrorism funding", "proceedings of crime", "proceedings of corruption", "money belonging to sanctioned entities" and so on).
It does NOT mean BofA made $5 billion
Of all the fucked up ways Bank Of America (like all big banks) scams, pillages, swindles and even forcefully extracts (with the help of their bought and paid for political minions) money out of society, this ain't it.