This is a stupid decision on the part of the copyright owners. Do they realise that people are not going to buy it regardless ? The only people that buy physical or digital copies of anything anymore are collectors and that's not regular people. I would say they should create a streaming service but like with anime more than one would be created and nobody is paying 40+ dollars,euro,pesos,pounds etc a month just to be able to have access to different mangas.
Companies are so oblivious to how anything works anymore and what people want in this generation. People only want one site for everything at a very low price, that's all people want. For example, they don't want Netflix and Amazon Prime and Disney+ (and Hulu and Apple TV for you Americans out there). They just want one giant Netflix platform with all the shows from everywhere else. I know monopoly is bad but people literally are struggling too much to care.