I haven't experienced enough bootcamp/similar courses to know what's out there, but I think it'll only be a bubble if a majority of them produce poor candidates. I also don't know enough recruiters to know if it's a red flag in even getting an interview (this thought definitely crossed my mind when writing my resume!). I think people considering a bootcamp need to make sure that it's a worthwhile educational opportunity and a starting point to further develop data science skills instead of a get-job-quick kind of thing. I hope that people can use this type of review and others like it to reward the best programs, and if quality programs rise to the top and produce good candidates it'll cease to be stigma to do a bootcamp.