The decision to rob the Garfield movie fans of another entry was no different than the decision to rob the Raimi movie fans of another entry as well. It's all a business that we can't control and just how things work.
Right. People always want to blame the executives, as if their choices were arbitrary whims, but it's really the audience's spending and viewing choices that force the executives' hands. Sony didn't reboot the Garfield series because they were mean or contrary, they rebooted it because the audience didn't respond well to it and so there was no profit in continuing it.
Besides, people have just been complaining above about how the Webb reboot was too similar to the Raimi version, how it just felt like a rehash of the same thing. That's because both were stuck with treating Spider-Man as the only superhero in his universe. Now Spidey gets to be part of the larger Marvel universe and play off other superheroes, which allows for a genuinely different approach that's more faithful to Spidey's role in the comics' universe. Plus there's the fact that Marvel Studios has been the only film studio able to consistently make well-received superhero films, so it was a smart move for Sony to turn over creative control to them while still retaining the film rights. That way, Sony profits from their quality and from the cachet of the MCU, and Marvel profits by finally getting their flagship character back. Business-wise, it's the smartest decision they could've made. And it's probably a good choice creatively too. I liked Garfield as Spidey a lot, but that doesn't outweigh all the other reasons that this was the logical decision.