Definitely. I'm American and I've lived in the Netherlands for the past three years. The difference is night and day.
Whenever I visit, I switch to my US SIM card and am immediately bombarded with spam texts (mostly from political parties) and scam calls. In my experience, Android is pretty good at marking calls and texts as "potential scams," but they're still there. In the Netherlands, I've gotten a few scam attempts via WhatsApp. Other than that, I think I've received one phone call soliciting donations to the Red Cross, and nothing else.
America doesn’t have privacy laws that prevent robot spam. Repercussions for violating the SPAM Act are not prosecuted very often.
Personally, the only “spam” I get is flagged by the cellular provider and 99% of the time the calls are silenced. Not really an issue for me. The only people that “call” me are in my contacts list anyways. Everyone else can leave a VM or text message.
It's also far, far cheaper to make calls to US mobiles than mobiles in any other developed country. Like call termination to an EU mobile is 10x+ than a US mobile.
Hmm... interesting. Spain should be covered by GDPR so you should be able to say "I reject right to process my personal data" and it should stop...
I had issue with Vodafone here - they were pestering me with calls/messages... even after I switched to Digi they were calling me for a week to try to convince me to stay (it just confirmed my decission to switch ;) )