Hi there, Tuta Team here. This is not correct, the price for Tuta Revolutionary is €3/mth with 20 GB of storage and 15 aliases - plus unlimited aliases when using your own domain. It's a very good deal.
The Revolutionary plan still only offers 3 custom domains. Furthermore, SimpleLogin provides unlimited aliases (custom domain or not) for $4/mo & unlimited custom domains. So SimpleLogin still appears to be more competitively priced overall.