Perhaps you're using a different definition of bootstrapping, but in my understanding it means "starting a business and getting to profitability without taking external money in the form of selling equity or taking on debt"[1]. Accelerators pretty much always take a small chunk of equity, and bank loans are debt (obviously). Crowd-funding in the Kickstarter sense, with "pre-order" sales of a thing, is bootstrapping, but crowd-funding in the seedrs sense with a crowd of people investing by-proxy isn't - it's just a fund raising in a different way.

[1] Similar to http://en.wikipedia.org/wiki/Bootstrapping_(business)#Financ...