Fundamentally it is just wrong. Not ethical. It is nearly impossible for someone to claim that an additive will bolster the performance of any oil without the potential of additive clash or diminishing the performance of the oil it is being added to. As an oil company, they start at a level of credibility that is higher than most additive companies; offering products like these ruin their credibility.I fail to see how a company's decision to sell additive products in addition to their oil creates an issue? Clearly this is a profit center for them.
To me it's similar to M1 selling all the different lines of oils - nobody needs anything beyond regular ol' M1 but we have: High Mileage. Extended. Extended High Mileage. Advanced Fuel Economy. Hybrid. Why all the different blends that nobody will likely show do a thing beyond the normal M1? Is it...marketing and profit-driven? Sure it is.
The M1 options you presented are fully formulated oils which have a certain level of performance that can be validated.