Instagram is making it difficult to flood your DM inbox. The social network is rolling out stricter DM request policies that, among other things, limits senders to a single message if you don't follow them. You'll have to accept the chat request before they can send anything more. DM requests are now limited to text, too. Creeps and spammers can't send photos, videos or voice messages, in other words.
The company started testing the new DM restrictions in late June. The company already has some tools to combat spam, including a "Hidden Words" tool that hides messages with objectionable keywords and emoji. There are now filters for scams and spam. You can also safeguard against surges in DM requests, although that won't stop the occasional spammer from getting through.