Now before you all get mad and say you submitted "counters", here's something Jordy has kindly notified me of.
A lot of the supposed Rotom-W counters is actually taken advantaged of with Volt Switch and Pain Split, which is actually one of the main points of using offensive Rotom-W, which is to annoy balance / bulky teams that regularly use Mega Latias / Ferrothorn / Amoonguss as their Rotom-W switch-in by allowing Rotom-W to gain health from Pain Split due to the naturally high HP stat of these checks, and to apply huge pressure on these Pokemon through Volt Switching out into an answer, and I briefly touched that by saying it annoys bulky teams at the start of the week:
Offensive Rotom-W is a great pivot with Volt Switch and Pain Split greatly annoying many bulky teams
I also quote from Jordy, "
something thats been brought to my attention a few times now with victim of the week is that the victim's role at hand is not taken into consideration".
Therefore, aside from the counters in the list above, which block Volt Switch and are immune to all of Rotom-W's moves, the remainder are merely checks because they are taken advantage of by Volt Switch, and a lot of them are actually pressured by its teammates (and by that I am referring to my builder with teams that include offensive Rotom-W only) like Tyranitar or Tornadus-T.
Furthermore, I will definitely be putting this into consideration while making the Checks/Counters list in the upcoming weeks, which I know is not a lot, and implement a new rule which I also hope to be brought into the new generation (assuming the targetted Pokemon is still in Swsh), which is Shedinja is banned from future checks and counters, as it can wall Pokemon without any super effective coverage against it, meaning if I post a set with nothing that allows it to touch Shedinja, like the most recent one, Shedinja is automatically a "counter", but in practice it might not always work, because there are many slight variations to the same set.
Also please remember to submit a full set, which should look like an importable from the Smogon Dex / Pokemon Showdown! Teambuilder and add at least brief descriptions to them (calcs or words).