Can't say I've noticed an increase, but I, too, get some now and then. They don't really manage to bother me though.

Definitely do report them if they get through the 'tell messages deemed spam' filter.

On the other hand, I think I have noticed more blatant bots (beyond fishing) partying around. I wouldn't say that it necessarily means an increase of any kind, except for me noticing them. xd