Weird form of poker

[mr.spam]

Today I've been playing a rather weird game of poker.

No blinds. Buy-in is €5. Instead of blinds, everybody puts a €0.10 ante each hand dealt. You can bet/raise whatever amount starting from the dealer clockwise, but can just check as well of course. If one player bets preflop, but no-one calls, everybody has to put in an extra €0.10. We were 6-7 handed today as we played, should be around the same every time.

Extra: One person said afterwards that 7-2-rule is also available, which means everybody has to pay 50 cent to a player who wins with 72o or 72s, either by showdown or by bluffing, but there was nobody who did this, so meh, don't know if it's true.

You can only buy in for more when average stack is at least €10 and then you can buy in for that amount.

Beatable game against the usual donks or crazy to play? If beatable, some important concepts to be considered?

Like for example, just open-shoving 72o preflop with starting stacks, you get €0.10+€0.10+€0.50 from each player, at a 7-handed table, that's €4.20, almost an entire buy-in.