Nicholass, You really should read the posting guidelines, You cannot tell people to not post. I've reported your post.
If a person joins a forum and *all* their posts are about a particular commercial service, even when the thread they post on is not asking about phone coverage, then yes it raises flags. Currently all 5 of your posts mention Rebelphone. One might think to have greater than 5 posts, being familiar with the posting rules, and how the community works before criticizing others on a forum.
OP's issue is that he hasn't found any options. Neither Rebelphone nor Telestial supply data in Spain, so it isn't about a "customized solution". It is about finding *something* that works. AT&T data works in Spain... fairly cheaply. Verizon does too, but you need a gsm capable phone IIRC. The days of the US based sim card providers appear to have ended. While I still carry one myself, I have not recommended it because it does not fulfill OP's requirement.