Five on Nostr: Yes. Difference: The potential Clients with issues post their problems first and then ...

Yes.
Difference: The potential Clients with issues post their problems first and then potential Troubleshooters can bid with Offers for the posted Tickets.

On Fiverr and similar platforms there is no bidding mechanism but Clients buy 'Gigs' that Troubleshooters define as their services beforehand as part of their Profile setup.

Here all you need is a nostr account to get things going.

These centralized platforms also don't use the users' Web of Trust (your web of not spam actually) to filter spam and scam.
They also control your possible connections borh ways and charge a hefty fee.

In SatShoot pledging support for app development is voluntary, however it is part of your displayed Reputation. This is the incentive to support this FOSS project.