You're basically arguing for a monopoly now.
Let them fail.
"They should do this thing in order to continue to succeed."
"Why?"
"Because if they don't they'll fail."
"Now you're arguing for a monopoly."
You can't possibly be arguing in good faith at this point.
You have to ignore the "They will have competition." to make your own bad faith argument.
PS: And then miss our further interaction
As a consumer, I don't want to go through the effort of finding the next Etsy. I want to be lazy and have the current Etsy be good.
Whatever comes next will be small. They will lack some of the things I want for many years.
As a lazy person I want sixpack abs, without putting in the effort.
Also - monopolies are never good.
If shouting at the sky had a chance to convince God to endow me with abs, I would make it a daily practice.
Etsy does listen to it's consumers, at least some times. The cost of complaining here is commensurate with the potential benefit.
If they do not, many sellers will stop using them. Many buyers will stop using them. They will have competition.