The $600 1099-K threshold for goods/services also applies to Venmo and similar because the new ceiling was part of the ARPA law passed by Congress. Form 1099-K went from having a floor of $20,000 in aggregate payments and 200 transactions to a threshold of $600 in aggregate payments regardless of number of transactions. The new rule is effective beginning with payment transactions settled after December 31, 2021. The effect of the rule is you get $600 at Venmo, $600 at Paypal, and so on. The number of IRS agents on-staff to enforce these requirements also increased recently via the Inflation Reduction Act.
Personally, I think the changes are ridiculous and just grab the small-time hobbyist. The government is avaricious if nothing else.
That said, some people prefer to use creative payment methods to evade taxes, but in the grand scheme, that is not a good idea. If you prefer checks, cash, money orders, etc., that's fine for personal convenience or preference, but getting creative to evade taxes is not worth the trouble that is federal tax evasion. If you have substantial income from bike stuff, best to deal squarely and pay taxes.