The SEC frequently goes after proverbial insider trading dentists who make ill gotten gains in the $100K range. Given the intense focus there would be to catch the market manipulators, a sub-$1 million haul wouldn't be much protection.
Those types are caught because they're people who do virtually no active trading and then buy an individual stock while related (and connected by phone/email contact) to an insider. Not day traders who have joined a massive herd of the world's favorite stock to short.
Yea, but it's been shown that well placed posts on wallstreetbets can cause trading activity. A post like "some of you guys are cool. Don't hold any tesla puts on Wednesday" might be enough to generate a bunch of trades you can hide under.