Anyone else notice a trend for people 3betting small out of the blinds recently?

I've noticed, what appears to be a relatively new phenomenon, which is people 3betting 7-8bb from the blinds (the SB in particular)? I've only really noticed this in the past month or two in 5nl & 10nl zoom on Pokerstars. From what I've seen it's typically not the better players in the pool who are doing this but I've seen a few regs using this sizing as well.

From seeing hands at showdown I have seen this sizing used for more speculative hands (66-88) all he way through to top of range hands (KK+)

Anyone else notice this and if so do they know what's driving it?

This seems really bad as they're going to be in a positional disadvantage with an increased SPR post-flop. I presume the best counter for this is to take advantage of the pot odds and widen my calling range?

How should it affect my 4betting range?