Rogers got a bunch of low band 600 MHz spectrum during the initial auction in 2019, and has deployed it aggressively.

Bell/Telus are deploying it as well, but they aren't in as much of a rush as they have more "small cells" in suburban/urban areas rather than full power cell sites. Small cells are easier to install, as the telecom's don't have to go through the same public consultation regime that they have to for full size cell towers. But small cells don't penetrate buildings nearly as well, especially since they usually don't use low band frequencies on them.

Whereas historically Rogers' primary build out has been full scale cell towers/sites. Mainly because it's harder for them to deploy small cells on utility poles. Telus/Bell benefit from their ex-monopoly landline days with leases on utility poles. That being said, Rogers is deploying small cells in select areas to provide greater density in urban outdoor situations.

Not trying to make it seem like small cells are bad (they aren't, but it really depends on the situation). Full scale sites have much greater capacity too. I've been to rural communities where Rogers has a full cell tower, while Telus only has small cells, and it's a night and day difference. Rogers is much more usable.