I never considered this route to build a startup. However, using statup accelerator is appropriate for many startups. For example, if you need a decent size AWS grant from AWS Activate for startups, you need to be associated with a startup accelerator.  Self-founded founder led startups do not get more than $1K in AWS Activate grant whereas incubator based startups can get up to $100K in AWS Activate credits. This is just a simple example of the benefits. There are tons of mentoring and funding connection benefits for being part of an incubator system.

So I have compiled a list of them that you can explore.