Many feel betrayed because he (partially at least) politically aligns with someone (and something) they loathe intensely. The feeling of betrayal probably comes from an implied idea that because they align on the issue of digital privacy they naturally do so in other aspects, and with the comments made by the CEO that idea is burst and someone who once felt familiar is now foreign.
12TB plan is €50/month though without a promo, which IMO is really fucking expensive.