Then don't use Discord. It's a gaming chat that is intended to be used while gaming as a primary goal of their service.

There are a wide variety of reasons to be critical of discord (many of them having little to do directly with Discord in particular) but the way they go about process scanning is unintrusive and pretty typical of similar apps, such as Steam, which is actually way more intrusive in some cases due to VAC.

Discord is a social media gaming program, it tracks what games you're playing so it can prompt your friends to join you in the game. It's not an Office Slack replacement which is also spyware, it's a gaming chat which grew out into being used by FOSS projects partly because it's so good cross-platform and partly because of IRC's gradual decline. You can see it happening in the always-on user list on the side which shows people are "Playing $Game" in their status. It also changes your status, visible in the client, I think.

Wacom tablets are a local computer input device. They have no business tracking or uploading anything in normal use, and you have no expectation or way to notice that it's happening.

All of your chat is sent to, and archived by, Discord, forever. That's annoying but server-central-not-encrypted-chat is their product. If I found all of my Discord chat messsages were being copied and uploaded to Wacom and archived forever, by a Wacom driver/app, I'd be incensed.