• People being rude/aggressive in bad faith, especially in a way that disrupts normal good-faith communication
• Coordinated brigading to disrupt normal, good-faith communication
• People using the platform for "CSAM"
• Spam
• Account hijacking
• Account impersonation

2/

• Gaming of engagement metrics
• Manipulation / gaming of the promotion algorithm
• Manipulation of the platform by foreign states
• Mass account registration, especially for bad-faith uses (brigading, spam, algorithm gaming)
• Advertising click fraud

3/

• Compliance with law enforcement requests
• Having to comply with awful censorship policies in order to legally operate abroad
• Having to comply with corrupt and undemocratic governments' horrifying / unethical law enforcement requests in order to legally operate abroad

4/

• Minors on the platform:
• Are they allowed to join? If not, preventing it
• If they are allowed to join, complying with privacy protections for minors
• Protecting them from abuse, manipulation, and harm when they do inevitably join, regardless of your policies

5/

Human nature is the hardest problem in tech.

6/6