Many of them "use" them, as in have them enabled to allow for members of the community to post to them, and sometimes they might offer patch note releases for updates via the announcement system or major issue posts, but most of them don't actually provide support and assistance via them or even moderate them at times. Huge problem actors are inde studios but, even large producers have the issue. My latest one that I tried to post a bug report to is Phasmaphobia, which locks all support to their discord, but like most games don't do official support via the forums and the only support you may find is if someone in the community has a workaround or fix.

edit: for the heck of it ill look at the current top 20 and see which offer official community support.

1. battlefield 6: skipped cause not released
2. Counterstrike 2: Contains patch notes; No Support, support is via steam help and email
3. steam deck (skipped cause hardware)
4. Blue Protocol: Star Resonance: No Steam Support
5. Little Nightmare 3: Skipped not released
6. Digimon Story Time Stranger: No support, recommended to go through website
7. Little nightmare 3 bundle (skipped not released)
8. megabonk: contains patch notes, no forum support
9. Wuthering Waves: Contains partial patch notes; No Forum Support
10. dead by daylight: No forum support: contains link to bug report and issue official forums.
11. Absolum: officially supports
12. Arena Breakout: infinite: contains patch notes no support
13. Call of Duty®: patch notes; no support
14. Black Ops 6 DLC blackcell: Skipped as DLC
15. Arc Raiders: Skipped not released
16. Ghost of Tushima: patch notes; No Support; contains link to official support knowledge base
17. Borderlands 4: patch notes; Major issue workarounds pinned but no official support
18. marvel rivals: patch notes; no official support
19. yooka-laylee owner discount: (bundle so skipped?)
20. Sonic Racing: crossworlds: patch notes No official support, issue pinned to give location for support.

Method to detect support:

I clicked the game, went to the discussions, if it had patch notes i noted it, if it has a community support tab or bug fix tab or comments that have staff responses I considered it community support. Else I marked it as no support. If it had a clear area to get support I noted that