Sorta.Roll for Combat cultivated that fanbase. They were extremely anti-WotC even as recent as a week ago. Watching them bash WotC was a favorite past-time of mine. There's not many online spaces I can go where I can even speak critically of 5e because WotC is so beloved in the industry (despite all their missteps this year.) There's a lot of reasons we should be able to be critical.
To completely 180 and gush about how much he loves the company - it doesn't feel authentic at all.
Stephen Glicker has definitely been a lot more critical about WotC, but Mark is typically a lot more even-keel about things in general. I don't even typically hear him gushing over PF2e and he co-wrote the rules for it. If something for PF2e is criticized, he'll explain the design intent behind why they made that choice at the time, how it's supposed to work at the table, and usually at least acknowledges that the criticism could be seen as valid from the perspective of the critic. Beyond the 2 of them, it really depends on who the guest is on how critical of WotC the stream gets. I usually try to listen in the background while I'm working and sometimes the guest is pretty horrible to listen to (the recent stream with Discourse Minis on it...? ugh...).
That having been said, Stephen is a businessman first and foremost. His game company makes 5e conversions of their PF2e products and he no doubt sees 3pp on DDB so he would be foolish to not see the possibilities for his company to expand their audience. While he's commented on WotC wanting to go full speed ahead with digital, it's not a hypocritical statement on his part IMO because he's acknowledged his own digital material outsells his print media to the point that their most recent Kickstarter didn't even offer a physical option and might not ever.