They are not legal in Spain, and probably neither in most of the civilized world (YMMV!). Over here a contract change needs to be approved by both parties at th

They are not legal in Spain, and probably neither in most of the civilized world (YMMV!). Over here a contract change needs to be approved by both parties at the time and with the specifics of the change, so a blanket "we might change this at any time" prior to it would also not be valid. I'm pretty sure (again in Spain) you could sue them and win, but you'd have to carry the cost of suing them AND the benefit would probably be small so not many individuals do. Some nice consumer defense groups do sue these companies and win again and again, which is amazing IMHO. Specially with the last ~10 years new data protection laws these shady practices are more and more illegal. > And I can't use the app unless I accept the new terms and services. For example Whatsapp keeps asking me to accept the new terms and I keep closing the popup, and still can use the app. We'll see how things end up, but for now they do not "force you" to accept them (though I'd say asking for it N times/day everyday might be considered harassment).