This is how old games should be handled throughout the industry when possible. The likelihood of someone not already familiar with a title or franchise to play it is a function of A) its cost and B) how dated it is. Once a game is seeing marginal returns, it's kind of a very corporate mindset to try and suck it dry of every last penny. Especially when you view games as a form of art.
I fear for so many incredible titles, especially as we possibly enter a real VR age.
Unless I force it on them (I probably will), my children may never give a second glance to the titles I grew up with and consider masterpieces, when they could sensually immerse themselves in a modern AAA or VR title.
So many great soundtracks, assets, feats of code, all deserving to be in a museum somewhere, lost in the ever-growing sea of content. Eventually only treasure-hunters like myself seek to experience and appreciate them.
Not only that, Sega can much more accurately determine what franchises might see profitable continuations, given a large enough sample size.
Having not played any of these titles on mobile myself, I can only imagine that Sega has ruined this very noble idea with intrusive ads and a payment scheme for removing them.