I don't think that the technicalities of creating an ERC-20 token and a website for an ICO were the distinguishing factor between a successful and an unsuccessful ICO and a scam. Also, it's easy to buy thousands of members for a Telegram group or posts in all kinds of "news" sites and create some buzz. In a way, these types of ICOs were not much different from other get-rich-quickly schemes that always had a certain lifetime until everyone noticed that those only work for a very selected group of people.
After these many years of ICOs being around, scams and (few) successful and (many) unsuccessful projects, potential should've gotten more sensitive to what kind of information you'd need to give other people money. We've also been through that with crowdfunding, but crowdfunding is still there and works (for some).
tl;dr: Such services are great for whoever wants to run a half-assed ICO or try to scam somebody, but they don't make an actual difference because the unavailability of this in the earlier days hasn't prevented any scammer from scamming.