I don't see more shops than would normally be there. But I don't really live in a heavily populated area.
What I do see is a whole lot of shops that just got put on the board at their base pay. I also have noticed a pattern of Smaller bonuses that are fewer and further between. I noticed one company that used to accept almost all of my offers offers now completely ignores them. I see jobs that were $40 bonused last month are now $30 bonused this month. And I see one of my regular shops, Is currently bonused for $10 less than it normally is at this stage in the game.
The pay doesn't seem to be going down, except that it's not increasing due to inflation either. But the bonuses are getting smaller as time goes by. The mystery shopping companies are banking on new shoppers who don't know any better, grabing all of them at lower bonuses than they previously would have offered to experienced shoppers.