what kind of launchpads are you referring to? WOuld be interested to check them out?
In simple definition the exchanges help you to launch token sales in their platform, there are a lot exchanges do offer this features [1], depends if they want to accept your project or not.
Do you want to create a project and run bounty promotion in this forum? I think there's nothing wrong to do it because you only need to pay with your worthless token which you create out of thin air. So you're not lose anything except time and energy.
[1]
https://zipmex.com/id/en/learn/what-is-launchpad/