Despite there not being an issue, there are many companies, including some very significant ones, that have restrictive rules about the use of GPL software just-in-case. Some flat out have a blanket “no GPL code at all” for the libraries and such that they use. I don't know if it still stands, but Android development at Google had a “no GPL in userspace” edict. If your service becomes big, you will get people asking you to change the licence so that they can use it.