Not when moving the price is the goal. If you trade specifically to create an unfair impression of the supply and demand of a stock that's market manipulation.
Thing is no one is going to prosecute a randomer on the internet for throwing $5k at an option especially when there's no proof that it was done in bad faith.
Shorting a stock because you genuinely believe the company is crap is not market manipulation.
To be clear, market manipulation is very vague and very broad, and from what I've read the SEC is only going after you if there was fraud or lying involved. Most of WSB's activity is not illegal market manipulation.
Trading (or posting) to cause impact and affect other positions you have is manipulation too. But it's not really provable in the case of WSB so they're safe.
It is not market manipulation for short interest to rise above 100%. It doesn't require anything nefarious. No collusion between institutional investors required either.
No, almost all personal trading is buying stocks. Options are derivatives that give you the right, but not the obligation, to buy or sell a security based on some predetermined price at or before some predetermined time. They essentially provide leverage such that $1 out of the money option has a much larger market impact than a $1 purchase of a stock.
This exactly what stock market speculation is about, is it?