There's no evidence that pitchers are using sunscreen and rosin for grip? Of course there is - it's all over the place, but the league, the teams and the players are ignoring it. Bauer is out there suggesting that MLB should just change their rules to allow it.
And even perhaps without the evidence, teams knew other teams were stealing their signs. We know that, we saw catchers going to multiple signs without anyone on base and there are reports that everyone in the league knew sign stealing was happening and were taking measures to prevent it (apparently except for the Jays and one other team who didn't seem to care).
And it's not a suspicion that the Astros are playing against players using PEDs - it's a reality. Some where caught and suspended, others weren't caught.