I think that most sellers won't "strike" simply because there's likely a financial incentive not to. For that week, you can be the only "custom sticker maker" on the platform and increase your profits. What can the other sellers do about it?!

The reason why workplace strikes work is because you are visibly seen 'crossing the picket' line and so majority of workers comply. Other Etsy sellers can see you continue to sell, but what does it matter, you don't work with them. They are all independent of each other.