A couple months ago I accepted an internship for this summer at a large, but unknown enterprise company.
The pay is fine, but the work is pretty irrelevant for the job market; Proprietary software, proprietary languages that only a few old companies use today and I'd be working on internal tools. I have no interest in working there as a full-time employee.
I got the job after being referred by a friend who is working there this summer.
I recently got an offer out of the blue from a previous internship boss who moved to a new company. The pay is 50% higher and the tech is modern and relevant. I'd also be working on production software and meaningful problems.
I am concerned that if I accept this new job, it could negatively affect my career as reneging would leave a black mark and they have already finished hiring.
Is it worth it to stay at the first job that is less relevant and interesting to prevent burning bridges?
Should I worry about burning bridges if I don't expect work with the 1st company's people anywhere else?