It started early in the year, before April.
However, the April date you mention was when MW introduced further any designer changes.
Part of this was telling people WHO they may boost at the expense of their choice, and the original purpose of the Boosts. Failure to abide by the new rules means you get less Boosts to share.
Originally, Boosts were meant to be targeted at smaller designer’s or those models a user found useful.
The change (weirdly defined by MW as the original purpose, despite what they said at the launch) was meant to reward larger designers already benefitting from all the other ways MW promotes specific designers.
They wrap up this new target by saying designers with more complicated models should receive the Boosts.
Never mind how much work goes into models or that they achieve the goal sought by the user as print in place and no assembly required.
Boosts have not been the only way points have been withheld.
Some, myself included are having their models suppressed. I assume this is in part to my public calls for improvements, a stop to the lies and actual communication when it should be made and not after public pressure.
Other are having their models hidden from users, they cannot be found in search results. I am also in this camp.
Last year I was in the top 1% of designers and in the top revenue earners, according to the year end reports. Famous(ish) for my then popular fidget spinners and the recipient of several DM’s a week thanking me for helping their students or child with my models that help ADD, ADHD and sensory issues. As the fidget spinners/gyros are so heavily suppressed, it is no longer worth me creating new ones. The users are the ones suffering because of this attack on me by MW.
This year, having been suppressed, the story is very different.
With over 800 models that I have uploaded, I could hit 1300 points in a single day at the height, today I will be lucky to hit 100 (a particular bad day today).
I cannot produce any reports as the Creator Center times out due to the large number of data points for me.
It has been a constant and devastating decline.