Lo and behold, opened a gmail account specifically for newsletters, subscribed to my swift, kotlin, design, UX and AI newsletters and I'm now using Apple Mail to have the time of my life consuming all the content I need, delivered to my inbox daily, with no spam, no friends, no follow, no ads, no nothing.
Of course there is still the possibility to provide a nice client rich in features for the common user so the idea for a startup is still in the air.
RSS is dead, long live newsletters.