Well it looks like the points have stopped for me - I've received 4x1000 points, the last on the 9th of August. I've had about 15 transactions since then and no more appearing. Hopefully that's not the monthly cap - though I guess at least it won't take too much in the way of effort to reach that target each month.
Look forward to hearing if anyone else has a similar outcome or if they keep earning beyond four bonuses.
Look forward to hearing if anyone else has a similar outcome or if they keep earning beyond four bonuses.