I just don't know how they mixed up the concept of alternatie timeline and multiverse together in name of multiverse.
For eg, in Tobey Maguire spiderman universe green Goblin arrived to tom Holland universe just before his death, therefore in Tobey Maguire universe Norman Osborn is not dead but missing. That will create an alternate timeline which may lead to none of the events happened in spiderman 2 and 3.
And in movie Dr Otto Octavius said that Norman Osborn is dead while he is missing that doesn't make any sense.
And even if somehow we leave all the factors of alternate time line, and focus on the finals of movie where every supervillain is cured and went to their respective universe so it means they went their orignal time which again create an alternate timeline in which all three are alive and now there is no significance for the events of spiderman 1 2 3 because none of them will be there in main timeline none of the event would ever have occurred and if they did without hindering the timeline then what the hell will be the continuity of each event.
Means
Tobey Maguire spiderman fight Norman Osborn just before his death he transpoted to different universe and comes bach Heald forward to Octavius transport to another universe and comes back cure and same to sand man