The entire use case of dynamic pricing is to raise prices.

Airlines were really the first to do this but there it kinda makes sense. You have a plane. It's going anyway. You want to fill it.

At the other extreme is RealPage, which is explicitly designed to raise rents and it's used by enough people that you can view it as the last frontier of anti-trust, anticompetitive behavior and price-fixing. It's also state-sanctioned violence because your price-fixing scheme has the threat of you being homeless attached to it.

That's another aspect to this: collusion doesn't happen in dark smoke-filled rooms anymore. It can be as simple as all "competitors" simply using the same software, which tells them all to do the same thing.

Another commenter had it right: this is beyond antitrust or competition law. It's a RICO issue.

There's no real structural reason for inflation since the pandemic. The pandemic simply broke the seal on raising prices and now everybody is in on it.