I'm still only a couple of months into using Invision again after many years.

Here's what I'm seeing a lot of--bots or spammers registering and not posting at all. The only action they take is replacing the banner image in their profile page with an image that contains the name of their company. I also see some that do the same with their profile picture.

I've been nuking these accounts immediately.

I'm wondering whether others get this, too.

And I'm also wondering whether there's a known SEO boost from text in images now that spammers are trying to abuse.

Yes, it’s normal. 
See this recent topic about spammers creating such accounts. 
https://invisioncommunity.com/forums/topic/462206-spam-defense-tuning/

 

Ah, exactly what I was looking for. Many thanks.