What Tesla did with bitcoin could be considered market manipulation, and that's a serious crime considered by the US government. The fact that the company invested $1.5B and make it public that bring a lot of investors to bitcoin, and after that, we see how bitcoin has a crazy jump in the prize, and now they sold the 10% when bitcoin was on its ATH.
As a reference, I will leave this link:
https://www.fbi.gov/scams-and-safety/common-scams-and-crimes/market-manipulation-pump-and-dump-fraudSo, the question is, did tesla make market manipulation and you think the company will be charged for it?
Was there any legal requirement and agreement that Tesla will not sell their bitcoin holdings ? I guess No.
So if they sell 10% of the holdings at all time high or sold all of their holdings, no one can charge them for this action. Tesla is a money making organization and hence they can make money by buying selling bitcoin holdings, although morally it is not good.
I don't know why this is an issue, I don't think 10% out of out Tesla's bag of btc is such a bad thing, even if they sell to take profit, they still hold 90% of their investment which is more than okey, between they also provide opportunity to buy Tesla with btc which will increase liquidity.