The creator is collecting 3500/month so that would be like cutting off his nose to spite his face and a foolish business decision.
Well...if you subtract Patreon's fee, payments from Patreons that fall through and further assume that he really is paying taxes on his income, it leaves him with around ~1.4k Euros or so per month.
While this is surely a livable single household income, even in Germany (especially for a student), it's not really a lot. Especially if he gets his diploma. Entry level academia jobs in Germany easily pay twice as much.
...and what's probably a lot more important: despite all, these jobs are a lot more reliable than depending on Patreon which may obliterate your livelihood in a flash with the next update to their TOS.