Onyl F2P games without paying for any micro-transaction guys while playing a proton title guys, the only non-scammy/sane way.
PROTON = 0 BUCKS for the moment.
Valve has to add a "Technically Supported Until EOS" green check mark... I could not care less of the "Verified" one (probably you could tolerate it if on steamdeck with the native steamos).